DHC Classic - Boiler STIEBEL ELTRON - Free user manual and instructions

USER MANUAL DHC Classic STIEBEL ELTRON

Certified to ANSI/UL Std. 499

Conforms to CSA Std. E335-1/3E & CSA E60335-2-35

Tested and certified by WQA to NSF/ANSI 372

for lead free compliance.

Simple line drawing of a mobile phone mounted on a stand (no text or symbols)

STIEBEL ELTRON

SPECIAL INFORMATION

OPERATION

1. General information 3
   1.1 Safety information
   1.2 Other symbols in this document 3
2. Safety
   2.1 Intended use
   2.2 Safety Precautions
   2.3 Test symbols 4
   2.4 Licenses / certificates 4
3. Register your product ____ 4
4. General description ____ 4

INSTALLATION

1. Mounting the unit 5
2. Water connections
   6.1 Aerator installation at connected faucet 6
3. Electrical connection 6
   7.1 DHC 3-2, and DHC 4-2 @ 208 V electrical connection ____ 7
   7.2 Terminal block 7
4. Commissioning
   8.1 Water heater handover 7
5. Troubleshooting 8
   9.1 Flow adjustment screw 8
   9.2 Safety thermal cut-out reset button 8
6. Normal maintenance
7. Technical Data
   11.1 Dimensions 9
   11.2 Wiring diagrams 10
   11.3 Temperature increase above ambient water temperature 10
   11.4 Data tables 11
8. Spare parts 13
9. Warranty 14

SPECIAL INFORMATION

- Read this entire manual. Failure to follow all the guides, instructions and rules could cause personal injury or property damage. Improper installation, adjustment, alteration, service and use of this unit can result in serious injury.

- This unit must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Proper installation is the responsibility of the installer. Failure to comply with the installation and operating instructions or improper use voids the warranty.

• Save these instructions for future reference. The installer should leave these instructions with the consumer.
  If you have any questions regarding the installation, use or operation of this water heater, or if you need any additional installation manuals, please call our technical service line at 800.582.8423 (USA and Canada only). If you are calling from outside the USA or Canada, please call USA 413.247.3380 and we will refer you to a qualified Stiebel Eltron service representative in your area.
• The water heater may be used by children aged 3 and older and persons with reduced physical, sensory or mental capabilities or a lack of experience and know-how, provided that they are supervised or they have been instructed on how to use the 9water heater safely and have understood the potential risks.
  9Children must never play with the water heater. Children must never clean the water heater or perform user maintenance unless they are supervised.
• Ensure the water heater can be separated from the power supply by a circuit breaker that disconnects all poles with at least 1/8" (3 mm) contact separation.
• The specified voltage must match the power supply. See the type plate on the right-hand side of the water heater for full information.
• The water heater must be properly grounded. See 11.2, "Wiring diagrams", pg. 10.
• The water heater must be permanently connected to fixed wiring. For use on an individual branch circuit only. See 11.2, "Wiring diagrams", pg. 10.
• Secure the water heater as described in chapter 5, "Mounting the unit", pg. 5.
• Observe the maximum permissible pressure (See 11.4, "Data tables", pg. 11).

OPERATION

1. General information

The chapters "Special information" and "Operation" are intended for both users and qualified contractors.

The chapter "Installation" is intended for qualified contractors.

Note

Read these instructions carefully before using the water heater and retain them for future reference.

Pass on the instructions to a new user if required.

1.1 Safety information

1.1.1 Structure of safety information

KEYWORD Type of risk

Here, possible consequences are listed that may result from not observing the safety information.

▶ Steps to prevent the risk are listed.

1.1.2 Symbols. type of risk

Symbol Type of risk

Injury

Electrocution

Burns

(burns, scalding)

1.1.3 Keywords

KEYWORD Description

DANGER If this information is not observed, it will result in serious injury or death.

WARNING If this information is not observed, it can result in serious injury or death.

CAUTION If this information is not observed, it can lead to medium or minor injury.

1.2 Other symbols in this document

Note

Notes are bordered by horizontal lines above and below the text. General information is identified by the symbol shown on the left.

▶ Read these notes carefully.

Symbol

Damage to the water heater and environment

Appliance disposal

2. Safety

Observe the following safety information and regulations.

Operate the water heater only when fully installed and with all safety equipment fitted.

2.1 Intended use

The water heater is intended for heating domestic hot water and can supply one draw-off point.

The DHC Classic can be used for hand washing type applications in the U.S. and Canada:

• Restroom sinks in commercial/industrial facilities and homes
• Kitchen areas in commercial /industrial facilities and homes
• Special uses in photo developing shops, laboratories etc.

The DHC Classic can also be used for whole apartments and homes in warm climate zones such as the Caribbean region, Central America, and Mexico due to the higher incoming water temperatures.

Any other use beyond that described shall be deemed inappropriate. Observation of these instructions and of the instructions for any accessories used is also part of the correct use of this water heater.

2.2 Safety Precautions

DANGER: Injury

Please read and follow these instructions. Failure to follow these instructions could result in serious personal injury or death.

Damage to the water heater and the environment

The water heater must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes.

Service of the water heater must be performed by qualified service technicians.

DANGER: Electrocution

Before beginning any work on the electric installation, be sure that main breaker panel switches are "off" to avoid any danger of electric shock. All mounting and plumbing must be completed before proceeding with electrical hook-up. Where required by local, state or national electrical codes the circuits should be equipped with "ground fault interrupter".

The unit must be properly grounded in accordance with state and local codes, or in absence of such codes, in accordance with national electric code or the Canadian electric code. Failure to electrically ground the product could result in serious personal injury or death.

DANGER: Electrocution

Never remove the appliance's cover unless the electricity servicing the appliance is turned off. Failure to do so could result in personal injury or death.

DANGER: Burns

Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from scalding. A hot water scalding potential exists if the thermostat on the water heater is set too high. Households with small children, disabled or elderly persons may require that the thermostat be set at 113 °F (45 °C) or lower to prevent possible injury from hot water.

WARNING: Injury

Where children or persons with limited physical, sensory or mental capabilities are to be allowed to control this water heater, ensure that this will only happen under supervision or after appropriate instructions by a person responsible for their safety. Children should be supervised to ensure that they never play with the water heater.

WARNING Electrocution

The connection to the power supply is only permissible as a permanent connection in conjunction with a 34 " Romex clamp. Ensure the water heater can be separated from the power supply by an isolator that disconnects all poles with at least 1/8'' (3 mm) contact separation.

Material losses

The user should protect the water heater against frost.

2.3 Test symbols

See type plate on the water heater.

2.4 Licenses / certificates

- UL (USA) Std. 499

- CSA (Canada) Std. E335-1/3E, and CSA E60335-2-35

3. Register your product

You must register this product within 90 days of purchase on our web site in order to activate the standard warranty or to be eligible for the extended warranty. Go to our web site at www.stiebel-eltron-usa.com and click on register your product.

Before beginning the registration process, we suggest that you gather the necessary information which will be as follows:

Type, Example: DHC 3-1 Classic (from the label that is on the unit)

Number listed after "Nr."

Place of Purchase

Purchase Date

First & Last Name

Email address

Physical Address

Phone Number

Installation Date

If you have any questions concerning the registration process or warranty options, please contact Stiebel Eltron USA directly at 800.582.8423.

4. General description

The DHC Classic tankless water heater differs from conventional storage type water heaters in several ways. It does not store hot water. Instead, water is heated instantaneously as it flows through the unit. The powerful heating elements are activated by a flow switch as water is drawn from a hot water faucet connected to the DHC Classic. Due to the absence of stand-by losses, the DHC Classic has greater energy efficiency than storage type water heaters.

The temperature of the hot water delivered by the DHC Classic depends on the wattage of the heating element, the temperature of the incoming cold water, and the water flow rate through the unit. In order for the DHC Classic to operate properly, it must be carefully matched to the application.

In case you have questions regarding the way you plan to use the DHC Classic, please call our technical service line at 800.582.8423 (USA and Canada). For service outside the U.S. and Canada, please call us at USA 413.247.3380. You can also e-mail us at [e-mail] or fax us at 413.247.3369.

INSTALLATION

5. Mounting the unit

1 7 6 5 4 3 2 D0000089950-a

1 Electrical junction box
2 1/2" water supply line for faucet installation
3 Shut-off valve
4 Cold water supply
5 Sink
6 Cold valve (right)
7 Hot valve (left)

DANGER: Electrocution

The unit must be installed in a vertical position with the water fittings pointing downward. Do not install unit where it would routinely be splashed with water. Electric shock may result.

1. Install DHC Classic as close as possible to the hot water draw-off point, for example, directly underneath the sink.
2. Install DHC Classic in a frost free area. If frost may occur, remove unit before freezing temperatures set in.
3. Leave a minimum of 5" of clearance on all sides for servicing.
4. Remove plastic cover by loosening the screw on the bottom. Lift cover off from the bottom. When reinstalling, insert the top of the cover into the rear housing first, then tilt the bottom into place. Re-tighten the cover screw.

Technical line drawing of two mechanical components with a screwdriver inserted, shown from different angles (no text or symbols present)

1. Mount the unit securely to wall by putting two screws through the mounting holes. Screws and plastic wall anchors for mounting on drywall or wood are provided.

Technical diagram showing a tool and component assembly with labeled parts and alignment lines

6. Water connections

NOTICE:

Excessive heat from soldering on copper pipes near the DHC Classic may cause damage.

The cold water connection to the unit must be disconnected periodically in order to clean the filter screen. It is required to use water connections that are easily detachable such as braided steel flex connectors.

NOTICE:

Hard water or water with a high mineral count may damage the unit. Damage to the unit caused by scale or a high mineral count is not covered under the warranty.

1. All plumbing work must comply with national and applicable state and local plumbing codes.
2. A pressure reducing valve must be installed if the cold water supply pressure exceeds 150 psi (10 bar).
3. Make certain that the cold water supply line has been flushed to remove any scale and dirt.
4. Install shut-off valve in cold water line as shown in illustration. This allows the unit to be isolated for maintenance purposes.
5. Cold water connection (inlet) is on the right side of the unit, hot water connection (outlet) is on the left side of unit.
6. Tankless water heaters such as the DHC Classic are not required to be equipped with a Temperature and Pressure Relief Valve (T&P). If the local inspector will not pass the installation without a T&P, it should be installed on the hot water outlet side of appliance.
7. The DHC Classic's hot water outlet is designed for connection to copper tubing, PEX tubing or a braided stainless steel hose with a 1/2'' NPT female tapered thread.
8. The plumbing on the cold water inlet side needs to be such that it can easily be removed to allow access to the inlet filter screen. The easiest way to achieve this is to use a braided steel flex connector. If soldering near the unit is necessary, please direct the flame away from the housing of the unit in order to avoid damage. Note that excessive heat from soldering near the cold water inlet fitting may damage the plastic filter screen located inside it.
9. When all plumbing work is completed, check for leaks and take corrective action before proceeding.

6.1 Aerator installation at connected faucet

DHC 3-1, 3-2, and 4-2 Classic models ship with a 0.5 gpm pressure compensating flow-reducer/aerator that must be installed on the faucet the water heater is connected to. Failure to install the aerator may result in lower water temperatures than desired.

7. Electrical connection

DANGER: Electrocution

Before beginning any work on the electric installation, be sure that main breaker panel switches are “off” to avoid any danger of electric shock. All mounting and plumbing must be completed before proceeding with electrical hook-up. Where required by local, state or national electrical codes the circuits should be equipped with a “ground fault interrupter.”

The unit must be properly grounded in accordance with state and local codes, or in absence of such codes, in accordance with national electric code or the Canadian electric code. Failure to electrically ground the product could result in serious personal injury or death.

WARNING Electrocution

The connection to the power supply is only permissible as a permanent connection in conjunction with a 34 " Romex clamp. Ensure the water heater can be separated from the power supply by an isolator that disconnects all poles with at least 1/8'' (3 mm) contact separation.

1. All electrical work must comply with national and applicable state and local electrical codes.
2. The DHC Classic should be connected to a properly grounded dedicated branch circuit of proper voltage rating. In installations with several DHC Classic units, each unit requires an independent circuit. Please refer to the technical data table for the correct wire and circuit breaker size.
3. A 34 " Romex clamp (required, not supplied) should be installed in the opening located between the hot and cold water connections. The wire should be fed through the Romex clamp. The "live" wires must be connected to the slots on the terminal block marked N and L (DHC 3-1, 4-3, 6-3, 9-3 Classic only) or L and L (all other versions). The ground wire must be connected to the slot marked with the ground symbol.

2.2" (56 mm) D000008948-a

1. Reinstall plastic cover. When reinstalling, insert the top of the cover into the rear housing first, then tilt the bottom into place. Re-tighten the cover screw.

7.1 DHC 3-2, and DHC 4-2 @ 208 V electrical connection

A 3/8" diameter rubber grommet is supplied as part of the required electrical installation with DHC 3-2 and DHC 4-2 Classic units.

1. When installing the DHC 3-2 Classic at either 208 or 240 V, or the DHC 4-2 Classic at 208 V, first feed the 14 AWG wire through the supplied rubber grommet. Prepare the wires according to the diagram:

A 2.2" (56 mm) B 3/8" diameter grommet 2.2" (56 mm)

Technical line drawing of a mechanical assembly with no visible text or symbols

1. A 34 " Romex clamp (required, not supplied) should be installed in the opening located between the hot and cold water connections. The wire with the rubber grommet in place should be fed through the Romex clamp. The "live" wires must be connected to the slots on the terminal block marked L and L. The ground wire must be connected to slot marked with the ground symbol.

2. Reinstall plastic cover. When reinstalling, insert the top of the cover into the rear housing first, then tilt the bottom into place. Re-tighten the cover screw.

7.2 Terminal block

Consult the chart below for the recommended torque amounts on the terminal block screws.

Screw Size (mm) Min. Torque (N·cm) Min. Torque (lbf·in)

M5 150-200 13.3-17.7

Using the proper torque specifications to secure wire to the wiring block helps to avoid personal loss or property damage.

8. Commissioning

WARNING: Open hot water faucet for a few minutes until water flow is continuous and all air is purged from water pipes. The unit's cover must be installed before the circuit breakers are turned on.

1. Vent the air from pipes and the water heater by opening the hot water faucet for a few minutes, until water flow is continuous and all air is purged from the water pipes.
2. Turn on circuit breaker to bring electrical power to the unit.
3. Open hot water faucet to a degree so that water flow is typical, i.e. until the water flow is the same as that encountered during normal use.
4. Wait twenty seconds until temperature has stabilized. Then check water temperature. If temperature is too low, the water flow rate needs to be reduced. In order to do this, turn off the unit's circuit breaker, remove the cover and turn the flow adjustment screw shown in illustration clockwise 12 turn (180 degrees) See 9.1, "Flow adjustment screw", pg. 8. Then reinstall plastic cover, turn on circuit breaker and check water temperature. This procedure should be repeated until the desired temperature is achieved. In case the water temperature is too high, turn the flow adjustment screw counter clockwise in the same manner until the desired temperature is achieved. The arrows in the illustration refer to the water temperature.
5. In order to obtain temperature control at a single spout mixer-type faucet, restrict cold water flow to faucet by partially closing the cold water shut-off valve under the sink until cold water and hot water flow rates are approximately the same.

8.1 Water heater handover

Explain the functions of the water heater to the user. Draw special attention to the safety information. Hand the operating and installation instructions to the user.

1. Troubleshooting

Symptom Possible cause Solution
No hot water but audible click can be heard when water is turned on.	Circuit breaker off Circuit breaker on
	Safety thermal cut-out tripped Reset thermal cut-out
	Heater may be undersized See 11.3, “Temperature increase above ambient water temperature”, pg. 10
No hot water and no audible click can be heard when water is turned on	Water flow too low to activate flow switch	Clean faucet aerator
		Open shut-off valve completely
		Increase flow by opening flow adjustment screw (turn counterclockwise)
Clean filter screen at DHC unit. See 10, “Normal maintenance”,		pg. 9
Water not warm enough	Water flow too high	Reduce water flow by closing flow adjustment screw (turn clockwise). See 11.3, “Temperature increase above ambient water temperature”, pg. 10
Voltage too low Supply correct voltage to unit

If you are not able to resolve a problem please contact us toll free at 800.582.8423 before removing the unit from the wall.

Stiebel Eltron is happy to provide technical assistance. In most instances, we can resolve the problem over the phone.

9.1 Flow adjustment screw

To lower the water temperature or increase water flow, open the flow adjustment screw by turning counterclockwise (-). This decreases the water temperature by increasing water volume.

To raise the water temperature or reduce water flow, close the flow adjustment screw by turning clockwise (+). This increases the water temperature by decreasing water volume.

Mechanical assembly diagram showing a valve mechanism with wrench and screwdriver (no text or labels)

9.2 Safety thermal cut-out reset button

DANGER: Electrocution

Do not attempt to reset the safety thermal cutout of this water heater unless power to the unit has been completely shut off at the circuit breakers.

Simple line drawing of a cylindrical container connected to an electrical outlet with a switch (no text or symbols)

26_02_02_1357

10. Normal maintenance

WARNING Electrocution

Before performing any work on the water heater, ensure power to the unit has been completely shut off at the circuit breaker.

NOTICE:

Hard water or water with a high mineral count may damage the unit. Damage to the unit caused by scale or a high mineral count is not covered under the warranty.

Note:

Other than the filter screen, the DHC Classic does not contain any parts serviceable by the lay person. In case of malfunction please contact a licensed plumber or electrician.

Stiebel Eltron DHC Classic tankless water heaters are designed for a very long service life. Actual life expectancy will vary with water quality and use. To ensure consistent water flow, it is recommended to periodically remove scale and dirt that may build up at the aerator of the faucet or in the shower head.

The DHC Classic has a built in sediment filter screen that should be cleaned periodically:

▶ Turn off power to the water heater at the circuit breaker.
▶ Turn off the water supply to the water heater at the shut-off valve.
▶ Open a connected hot water tap to relieve built-up pressure (this will minimize leakage when removing the connection from the cold water inlet).
▶ Disconnect the braided steel flex connector from the cold water inlet fitting (right).
▶ To remove the filter screen from the bottom of the cold water inlet, carefully insert a flathead screwdriver just above the plastic lip of the filter screen, and gently pull downward.
▶ Clean the filter screen, re-insert securely into the cold water inlet fitting, and reconnect the braid steel flex connector to the cold water inlet.
▶ Open the cold water supply shut-off valve.
▶ Vent the air from pipes and the water heater by opening the hot water faucet for a few minutes, until water flow is continuous and all air is purged from the water pipes.
▶ Turn on circuit breaker to bring electrical power to the unit.

11. Technical Data

11.1 Dimensions

b01 14³/₁₆" (360) Mounting holes, rear cover 12⁵/₈" (320) 1⁹/₁₆" (40) ½" (13) c06 3¹⁵/₁₆" (100) 7¹⁵/₁₆" (202) c01 1³/₈" (35) 3⁷/₆" (98) D000089946-c

b01 electrical supply cable

c01	cold water connection	1/2'' NPT
c06	hot water connection	1/2'' NPT

11.2 Wiring diagrams

DHC 3-2 Classic, DHC 4-2 Classic, DHC 5-2 Classic

A 2/GND E 208 A 240 V

DHC 4-3 Classic

B 1/N/GNQ \~L27V

A B L L N L

85_02_02_0008

DHC 6-2 Classic, DHC 8-2 Classic, DHC 10-2 Classic

A L L 2/GND - 208 / 240 V

DHC 6-3 Classic, DHC 9-3 Classic

B N L 1/N/GND \~ 277 V

DHC 3-1 Classic

B 1/N/0NDL\~120 V

A B L L N L

05_02_02_0009

11.3 Temperature increase above ambient water temperature

[°F]

Type kW GPM (gallons per minute)

		0.32	0.43	0.48	0.53	0.69	0.80	1.0	1.5	2.0
DHC 3-1	3.0	65	49	43	41	30	26	20	14	10
DHC 3-2	2.5	54	40	35	34	25	21	17	11	9
	3.3	71	53	47	45	33	28	22	15	11
DHC 4-2	2.9	-	47	41	40	29	25	20	13	10
	3.8	-	61	54	52	38	33	26	17	13
DHC 4-3	4.5	-	73	64	61	45	39	31	20	15
DHC 5-2	3.6	-	58	51	49	36	31	25	16	12
	4.8	-	77	68	65	48	41	33	22	16
DHC 6-2	4.5	-	-	64	61	45	39	31	20	15
	6.0	-	-	85	82	60	52	41	27	20
DHC 6-3	6.0	-	-	85	82	60	52	41	27	20
DHC 8-2	5.4	-	-	-	-	54	46	37	25	18
	7.2	-	-	-	-	71	62	49	33	25
DHC 9-3	9.0	-	-	-	-	-	77	58	41	31
DHC 10-2	7.2	-	-	-	-	-	62	49	33	25
	9.6	-	-	-	-	-	82	65	44	33

Min. water flow to activate unit

[°C]

Type	kW	L/min (Liters per minute)
		1.2	1.6	1.8	2.0	2.6	3.0	4.0	5.0	7.5
DHC 3-1	3.0	36	27	24	22	17	14	11	9	6
DHC 3-2	2.5	30	22	20	18	14	12	9	7	5
	3.3	39	30	26	24	18	16	12	9	6
DHC 4-2	2.9	-	26	23	21	16	14	10	8	6
	3.8	-	34	30	27	21	18	14	11	7
DHC 4-3	4.5	-	40	36	32	25	22	16	13	9
DHC 5-2	3.6	-	32	29	26	20	17	13	10	7
	4.8	-	43	38	34	26	23	17	14	9
DHC 6-2	4.5	-	-	36	32	25	22	16	13	9
	6.0	-	-	48	43	33	29	22	17	11
DHC 6-3	6.0	-	-	48	43	33	29	22	17	11
DHC 8-2	5.4	-	-	-	-	30	26	19	15	10
	7.2	-	-	-	-	40	34	26	21	14
DHC 9-3	9.0	-	-	-	-	-	43	32	26	17
DHC 10-2	7.2	-	-	-	-	-	34	26	21	14
	9.6	-	-	-	-	-	46	34	28	18

Min. water flow to activate unit

11.4 Data tables

DHC 3-1 Classic DHC 3-2 Classic DHC 4-2 Classic DHC 4-3 Classic DHC 5-2 Classic
	202646	202647		202648		202649	202650
Electrical details
Voltage	120 V	208 V	240 V	208 V	240 V	277 V	208 V
Wattage	3.0 kW	2.5 kW	3.3 kW	2.9 kW	3.8 kW	4.5 kW	3.6 kW
Amperage	25 A	12 A	14 A	14 A	16 A	17 A	18 A
Minimum recommended circuit breaker size ^1	25 A	15 A	15 A	15 A	20 A	20 A	20 A
Minimum recommended wire size (copper) ^2	10 AWG	14 AWG		14 AWG	12 AWG	12 AWG	12 AWG
Power connection	1/N/GND	2/GND		2/GND		1/N/GND	2/GND
Connections
Water connection ^3	1/2" NPT
Total alkaline earths	2.5 mol/m ^3
Total hardness (H _2 O)	14 Degree d
Hardness range	2 (average hardness)
Hydraulic data
Rated capacity	0.13 gal (0.5 l)
Values
Max. permissible inlet temp.	86 °F (30 °C)
Min. water flow to activate unit	0.32 gpm (1.2 l/min)	0.32 gpm (1.2 l/min)		0.43 gpm (1.6 l/min)		0.43 gpm (1.6 l/min)	0.43 gpm (1.6 l/min)
Pressure drop at flow rate	3.33 psi (0.023 MPa)	3.33 psi (0.023 MPa)		3.33 psi (0.023 MPa)		3.33 psi (0.023 MPa)	3.33 psi (0.023 MPa)
Flow rate for pressure drop	0.32 gpm (1.2 l/min)	0.32 gpm (1.2 l/min)		0.43 gpm (1.6 l/min)		0.43 gpm (1.6 l/min)	0.43 gpm (1.6 l/min)
Application limits
Max. permissible pressure	150 psi (1 MPa)
Test pressure	300 psi (2 MPa)
Versions
Pressure vessel material	Copper
Heating system	Tubular heater
Cover and back panel	Plastic
Color	White
Dimensions
Height	143 _16 in (360 mm)
Width	7 15 _16 in (202 mm)
Depth	3 7/a in (98 mm)
Weights
Weight	5.5 lb (2.5 kg)	4.6 lb (2.1 kg)		4.6 lb (2.1 kg)		4.6 lb (2.1 kg)	4.6 lb (2.1 kg)

DHC 3-1, 3-2, 4-2 Classic ship with a 0.5 GPM pressure compensating flow-reducer/aerator that must be installed.

Overcurrent protection sized at 100% of load (DP for 240/208/277 V & SP for 120 V models). Tankless water heaters are considered a non-continuous load. GFCI Class A circuit breakers are recommended.

^2 Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.

^3 Suitable for supply with cold water only.

These are our recommendations. Check local codes for compliance if necessary.

	DHC 6-2 Classic DHC 6-3		Classic DHC 8-2 Classic DHC 9-3 Classic DHC 10-2 Classic
202651 202652 202653 202654	202655
Electrical details
Voltage	208 V	240 V	277 V	208 V	240 V	277 V	208 V
Wattage	4.5 kW	6.0 kW	6.0 kW	5.4 kW	7.2 kW	9.0 kW	7.2 kW
Amperage	22 A	25 A	21.7 A	26 A	30 A	32.5 A	35 A
Min. recommended circuit breaker size1	25 A	25 A	25 A	30 A	30 A	35 A	35 A
Min. recommended wire size (copper)2	10 AWG		10 AWG	10 AWG		8 AWG	8 AWG
Power connection	2/GND		1/N/GND	2/GND		1/N/GND	2/GND
Connections
Water connection3	1/2" NPT
Total alkaline earths	2.5 mol/m3
Total hardness (H2O)	14 Degree d
Hardness range	2 (average hardness)
Hydraulic data
Rated capacity	0.13 gal (0.5 l)
Values
Max. permissible inlet temp.	86°F (30°C)
Min. water flow to activate unit	0.48 gpm (1.8 l/min)		0.48 gpm (1.8 l/min)	0.69 gpm (2.6 l/min)		0.8 gpm (3.0 l/min)	0.8 gpm (3.0 l/min)
Pressure drop at flow rate	3.33 psi (0.023 MPa)		3.33 psi (0.022 MPa)	3.63 psi (0.025 MPa)		4.35 psi (0.03 MPa)	4.35 psi (0.03 MPa)
Flow rate for pressure drop	0.48 gpm (1.8 l/min)		0.48 gpm (1.8 l/min)	0.69 gpm (2.6 l/min)		0.8 gpm (3.0 l/min)	0.8 gpm (3.0 l/min)
Application limits
Max. permissible pressure	150 psi (1 MPa)
Test pressure	300 psi (2 MPa)
Versions
Pressure vessel material	Copper
Heating system	Tubular heater
Cover and back panel	Plastic
Color	White
Dimensions
Height	143/16 in (360 mm)
Width	715/16 in (202 mm)
Depth	37/sin (98 mm)
Weights
Weight	5.5 lb (2.5 kg)

Overcurrent protection sized at 100% of load (DP for 240/208/277 V & SP for 120 V models). Tankless water heaters are considered a non-continuous load. GFCI Class A circuit breakers are recommended.
2 Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load.
^3 Suitable for supply with cold water only.
These are our recommendations. Check local codes for compliance if necessary.

1. Spare parts

No.	Spare part DHC 3-1 Classic	DHC 3-2 Classic	DHC 4-2 Classic	DHC 4-3 Classic	DHC 5-2 Classic
1	Heating system	165889	167769	167770	165890	167771
2	Flow switch	165273	165273	162162	162162	162162
3	Thermostat	162472	162472	162472	162472	162472
4	Switch	168026	168026	168026	168026	168026
5	Housing (back)	326968	326968	326968	326968	326968
6	Plumbing connection	326589	326589	326589	326589	326589
7	Housing (front)	326965	326965	326965	326965	326965
8	Safety thermal cut-out	162474	162474	162474	162474	162474
9	Wiring block	026010	026010	026010	026010	026010
10	Copper tube	162314	162314	162314	162314	162314
11	Module chassis	342052	342052	342052	342052	342052
12	Locking sheet	326234	326234	326234	326234	326234
13	Filter screen	275981	275981	275981	275981	275981
No.	Spare part	DHC 6-2 Classic	DHC 6-3 Classic	DHC 8-2 Classic	DHC 9-3 Classic	DHC 10-2 Classic
1	Heating system	171117	342051	167772	296874	167773
2	Flow switch	171105	171105	162164	162165	162165
3	Thermostat	162472	162472	162472	162472	162472
4	Switch	168026	168026	168026	168026	168026
5	Housing (back)	36968	326968	326968	326968	326968
6	Plumbing connection	326589	326589	326589	326589	326589
7	Housing (front)	326965	326955	326965	326965	326965
8	Safety thermal cut-out	162474	162474	162474	162474	162474
9	Wiring block	026010	026010	026010	0126010	026010
10	Copper tube	162314	162314	162314	162314	162314
11	Module chassis	342052	342052	342052	342052	342062
12	Locking sheet	326234	326234	326234	326234	326234
13	Filter screen	275981	275981	275981	275981	275981

Technical diagram of a mechanical device with numbered components for identification

13. Warranty

Subject to the terms and conditions set forth in this limited warranty, Stiebel Eltron, Inc. (the "Manufacturer") hereby warrants to the original purchaser (the "Owner") that each Tankless Electric Domestic Hot Water Heater (the "Heater") shall not (i) leak due to defects in the Manufacturer's materials or workmanship for a period of seven (7) years from the date of purchase or (ii) fail due to defects in the Manufacturer's materials or workmanship for a period of three (3) years from the date of purchase. As Owner's sole and exclusive remedy for breach of the above warranty, Manufacturer shall, at the Manufacturer's discretion, send replacement parts for local repair; retrieve the unit for factory repair, or replace the defective Heater with a replacement unit with comparable operating features. Manufacturer's maximum liability under all circumstances shall be limited to the Owner's purchase price for the Heater.

This limited warranty shall be the exclusive warranty made by the Manufacturer and is made in lieu of all other warranties, express or implied, whether written or oral, including, but not limited to warranties of merchantability and fi tness for a particular purpose. Manufacturer shall not be liable for incidental, consequential or contingent damages or expenses arising directly or indirectly from any defect in the Heater or the use of the Heater. Manufacturer shall not be liable for any water damage or other damage to property of Owner arising, directly or indirectly, from any defect in the Heater or the use of the Heater. Manufacturer alone is authorized to make all warranties on Manufacturer's behalf and no statement, warranty or guarantee made by any other party shall be binding on Manufacturer.

Manufacturer shall not be liable for any damage whatsoever relating to or caused by:

1. any misuse or neglect of the Heater, any accident to the Heater, any alteration of the Heater, or any other unintended use;
2. acts of God and circumstances over which Manufacturer has no control;

The installation, electrical connection and first operation of this appliance should be carried out by a qualified installer.

The company does not accept liability for failure of any goods supplied which have not been installed and operated in accordance with the manufacturer's instructions.

Environment and recycling

Please help us to protect the environment by disposing of the packaging in accordance with the national regulations for waste processing.

1. installation of the Heater other than as directed by Manufacturer and other than in accordance with applicable building codes;
2. failure to maintain the Heater or to operate the Heater in accordance with the Manufacturer's specifications;
3. operation of the Heater under fluctuating water pressure or in the event the Heater is supplied with non-potable water, for any duration;
4. improper installation and/or improper materials used by any installer and not relating to defects in parts or workmanship of Manufacturer;
5. moving the Heater from its original place of installation;
6. exposure to freezing conditions;
7. water quality issues such as corrosive water, hard water, and water contaminated with pollutants or additives;

Should owner wish to return the Heater to manufacturer for repair or replacement under this warranty, Owner must first secure written authorization from Manufacturer. Owner shall demonstrate proof of purchase, including a purchase date, and shall be responsible for all removal and transportation costs. If Owner cannot demonstrate a purchase date this warranty shall be limited to the period beginning from the date of manufacture stamped on the Heater. Manufacturer reserves the right to deny warranty coverage upon Manufacturer's examination of Heater. This warranty is restricted to the Owner and cannot be assigned.

Some States and Provinces do not allow the exclusion or limitation of certain warranties. In such cases, the limitations set forth herein may not apply to the Owner. In such cases this warranty shall be limited to the shortest period and lowest damage amounts allowed by law. This warranty gives you specific legal rights and you may also have other rights which vary from State to State or Province to Province.

Owner shall be responsible for all labor and other charges incurred in the removal or repair of the Heater in the fi eld. Please also note that the Heater must be installed in such a manner that if any leak does occur, the flow of water from any leak will not damage the area in which it is installed.

This Warranty is valid for U.S.A. & Canada only. Warranties may vary by country. Please consult your local Stiebel Eltron Representative for the Warranty for your country.

NOTES

Technical line drawing of two mechanical components with screw holes and a valve, shown from different angles (no text or symbols)

Technical diagram showing mechanical assembly with labeled components and directional arrows, including a close-up of a lock mechanism.

6. Conexión de agua

NOTA:

Mechanical assembly diagram showing a motor or engine component with labeled parts and directional arrows (no readable text or symbols)

Technical line drawing of a cylindrical device with a curved pipe and a rectangular component, no text or symbols present.

10. Mantenimiento

PELIGRO: Electrocución

A B L L N L 85_02_02_0008

85_02_02_0008

A B L L N L

85_02_02_0009

Technical diagram of a device with numbered components, likely an air conditioning or gasifier assembly.

13. Garantía

Technical line drawing of two mechanical components with a screwdriver inserted, shown from different angles (no text or symbols present)

Technical diagram showing mechanical assembly and mounting details with labeled components and directional arrows

Technical line drawing of a mechanical assembly with no visible text or symbols

Simple line drawing of a cylindrical container connected to an electrical component with a black arrow indicating direction (no text or symbols)

26_02_02_1357

10. Maintenance normale

DANGER: Électrocution

A B L L ⊕ N L ⊕

85_02_02_0008

A B

85_02_02_0009

Exploded view diagram of a device with numbered components for identification

13. Garantie

17 West Street | West Hatfield MA 01088

Tel. [phone] | Fax [phone]

[e-mail]

www.stiebel-eltron-usa.com

STIEBEL ELTRON