OTG80SLSIMB6 - Water heater GORENJE - Free user manual and instructions

Product Type	Electric Storage Water Heater
Model	OTG80SLSIMB6
Brand	Gorenje
Capacity	80 Liters
Dimensions (H x W x D)	850 x 450 x 450 mm
Weight (empty)	25 kg
Power Consumption	2000 W
Voltage / Frequency	220-240 V / 50-60 Hz
Energy Efficiency Class	C
Standby Power Consumption	0.5 W
Water Connection	G 1/2" inlet/outlet
Max Operating Pressure	8 bar
Temperature Range	30 – 75 °C
Thermostat	Adjustable mechanical thermostat
Safety Features	Overheat protection, pressure relief valve, dry heating protection
Material	Enameled steel tank with magnesium anode
Insulation	High-density polyurethane foam
Installation	Wall-mounted, vertical
Water Connection Type	Bottom connection
Control Type	External knob with indicator light
Heating Time (ΔT 45°C)	Approx. 120 minutes
IP Rating	IPX4
Maintenance	Periodic descaling, anode rod replacement every 2-3 years
Repairability	Replaceable thermostat, heating element, and anode rod

Frequently Asked Questions - OTG80SLSIMB6 GORENJE

How do I install the Gorenje OTG80SLSIMB6 water heater?

Installation should be performed by a qualified professional. The water heater must be mounted vertically on a wall that can support its weight when full. Connect to cold water inlet and hot water outlet using appropriate fittings, and ensure the pressure relief valve is installed correctly. Refer to the manual for detailed steps.

What is the recommended temperature setting for daily use?

For optimal energy efficiency and safety, set the thermostat between 50°C and 60°C. This reduces the risk of scalding and minimizes heat loss. For higher demand, you can increase up to 75°C, but be cautious of hot water burns.

How often should I descale the water heater?

Descaling frequency depends on water hardness. Generally, every 6 to 12 months is recommended. Use a descaling solution appropriate for enamel tanks or follow the instructions in the manual. Regular descaling improves efficiency and prolongs lifespan.

What does the pressure relief valve do and how to test it?

The pressure relief valve automatically releases excess pressure to prevent tank rupture. Test it every few months by lifting the lever briefly to see if water flows. If it does not, or if it leaks continuously, replace the valve immediately.

Why is hot water running out quickly?

Possible reasons: the thermostat is set too low, the heating element is faulty, or there is sediment buildup reducing capacity. Check the temperature setting first; if problem persists, inspect the anode rod and heating element, and consider descaling.

How do I replace the magnesium anode rod?

Turn off power and water supply, drain the tank, then locate the anode rod on top or side of the heater. Unscrew the old rod and install a new one with Teflon tape on threads. Tighten securely, refill, and check for leaks. Replace every 2-3 years.

Is the water heater safe to leave on all the time?

Yes, it is designed for continuous operation. The thermostat maintains set temperature, and safety features prevent overheating. However, to save energy, you can use a timer to switch off during periods of low demand.

What is the energy consumption of this water heater?

The power consumption is 2000W. Actual energy usage depends on water usage and temperature setting. On average, an 80L heater consumes about 1.5-2.5 kWh per day for a family of 4, but this varies.

Can I install the water heater horizontally?

No, the Gorenje OTG80SLSIMB6 is designed for vertical wall-mounted installation only. Horizontal installation may cause improper water stratification, air pockets, and damage to the heating element.

What does the indicator light mean?

The indicator light shows when the heating element is active. When the water reaches the set temperature, the thermostat switches off the element and the light goes out. If the light stays on continuously, the water may not be reaching the set temperature.

USER MANUAL OTG80SLSIMB6 GORENJE

OTG SLIM SIMPLICITY

Instructions for Use 16

Dear customer, thank you for purchasing our product. PLEASE READ THE INSTRUCTIONS CAREFULLY BEFORE INSTALLING AND USING THE WATER HEATER FOR THE FIRST TIME.

The device is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities or lack of experience or knowledge, unless they are supervised or instructed in its use by a person responsible for their safety.

CHILDREN MUST BE SUPERVISED TO PREVENT THEM FROM PLAYING WITH THE DEVICE.

Dear buyer, we thank you for purchase of our product.

PLEASE READ THE INSTRUCTIONS THOROUGHLY PRIOR TO THE INSTALLATION AND FIRST USE OF THE WATER HEATER.

THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS (INCLUDING CHILDREN) WITH REDUCED PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE AND KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION CONCERNING USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR SAFETY.

CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY WITH THE APPLIANCE.

This water heater has been manufactured in compliance with the relevant standards and tested by the relevant authorities as indicated by the Safety Certificate and the Electromagnetic Compatibility Certificate. Its basic technical properties are stated upon the nameplate, glued between the connection pipes. The water heater may be connected to water and electric power supply only by a qualified specialist. The reach in its inside due to the repair or removal of limestone and checking and replacement of anti-corrosion protection anode may be performed only by an authorised service workshop.

INSTALLATION

The water heater should be installed as close as possible to the points of use to avoid heat dispersion along the pipes. It should be fastened to the wall with appropriate bolts with minimum diameter of 8 mm. In case the wall in question cannot support the weight three times that of the heater filled with water, the relevant section of the wall (where the heater is to be installed) must be suitably reinforced. OTG water heater must be mounted to the wall in the upright position.

TECHNICAL PROPERTIES OF THE APPLIANCE

Type	OTG 30 N	OTG 50 N	OTG 65 N	OTG 80 N	OTG 100 N	OTG 120 N
Volume [l]	30	50	65	80	100	120
Rated pressure [MPa]	0,6
Weight / Filled with water [kg]	19/49	24/74	28/93	31/111	36/136	41/161
Anti-corrosion protection of tank	Enameled / Mg Anode
Connected power [W]	2000
Voltage [V~]	230
Degree of protection	I
Grad des Apparatschutzes	IP 24
Heating time to 75°C1) [h]	105	155	230	305	355	435
Quantity of mixed water at 40°C [l]	58	94	124	148	194	226
Energy consumption2) [kWh/24h]	0,90	0,99	1,13	1,26	1,71	1,81

1) Time for heating of the whole volume of heater with electric immersion heater by entering temperature of cold water from water supply 15°C. 2) Energy consumption to maintain stable temperature of water in the water heater 65°C at surrounding temperature 20°C, measured according to DIN 44532.

	A	B	C
OTG 30 N	510	310	235
OTG 50 N	690	470	250
OTG 65 N	820	605	245
OTG 80 N	950	735	245
OTG 100N	1125	900	255
OTG 120N	1300	900	430

Dimensions of the water heater for installation and connection [mm]

CONNECTION TO THE WATER SUPPLY

The water heater connections for the in-flowing and out-flowing water are colour-coded. The connection for the supply of cold water is coloured blue, while the hot water outlet is coloured red.

The water heater may be connected to the water supply in two ways. The closed-circuit pressure system enables several points of use, while the open-circuit gravity system enables a single point of use only. The mixer taps must also be purchased in accordance with the selected installation mode.

The open-circuit gravity system requires the installation of a non-return valve in order to prevent the water from draining out of the tank in the event of the water supply running dry or being shut down. This installation mode requires the use of an instantaneous mixer tap. As the heating of water expands its volume, this causes the tap to drip. The dripping cannot be stopped by tightening it further; on the contrary, the tightening can only damage the tap.

The closed-circuit pressure system requires the use of pressure mixer taps. For safety reasons the supply pipe must be fitted with a return safety valve or alternatively, a valve of the safety class that prevents the pressure in the tank from exceeding the nominal pressure by more than 0.1 MPa.

The heating of water in the heater causes the pressure in the tank to increase to the level set by the safety valve. As the water cannot return to the water supply system, this can result in the dripping from the outlet of the safety valve. The drip can be piped to the drain by installing a catching unit just below the safety valve. The drain installed below the safety valve outlet must be piped down vertically and located in the environment that is free from the onset of freezing conditions.

In case the existing plumbing does not enable you to pipe the dripping water from the return safety valve into the drain, you can avoid the dripping by installing a 3-litre expansion tank on the inlet water pipe of the boiler.

You should ensure that the return safety valve is functioning properly by checking it on a regular basis i.e. every 14 days. To check the valve, you should open the outlet of the return safety valve by turning the handle or unscrewing the nut of the valve (depending on the type of the valve). The valve is operating properly if the water comes out of the nozzle when the outlet is open.

Legend: 1- Return safety valve

2- Bimetallic fuse 3- Non-return valve 4- Pressure reduction valve 5- Closing valve

6- Checking fitting 7- Funnel with outlet connection

H - Cold water

T - Hot water

Between the water heater and return safety valve no closing valve may be built-in because with it the function of return safety valve would be impeded.

The water heater may be connected to the house water network without a pressure reducing valve if the network pressure is lower than 0.5 MPa (5 bar). If the pressure exceeds 0.5 MPa (5 bar), a pressure reducing valve must be installed. Prior to the electrical connection, the water heater must be filled with water. When filling for the first time, open the hot water tap on the mixing faucet. When the heater is filled with water, water will start to run from the outlet pipe of the mixing faucet.

POWER CONNECTION

The power lead must be attached to the water heater before connecting it to the power supply. To do this, first unscrew the protective cover from the water heater. The water heater must be connected to the power supply in accordance with the requirements of the relevant standards for electrical installations. For safety reasons, a switch should be installed on the lead connecting the heater to the power grid, i.e., a switch that disconnects both poles of the power supply with a minimum of 3 mm distance between the open contacts.

Legend:

1 - Thermostat 2 - Temperature safety device 3 - Heating element 4 - Light indicator 5 - Connector

L - Phase conductor

N - Neutral conductor

1/2 - Earth conductor

Electrical installation

WARNING: The appliance must be disconnected from the power supply before opening and reaching inside the water heater.

USE AND MAINTENANCE

After connecting to the water and electrical networks, the heater is ready for use. By turning the thermostat knob on the front of the protective cover, the desired water temperature between 25°C and 75°C can be selected. We recommend setting the knob to the "E" position. This setting is the most economical; with it, the water temperature will be about 55°C, and the buildup of limescale and heat loss will be less than when set to a higher temperature.

The operation of the electric immersion heater is indicated by a pilot light. On the perimeter of the water heater, there is a built-in thermometer that shows the water temperature.

When the heater is not used for a long time, its contents must be protected against freezing. To do this, do not switch off the power supply, but adjust the thermostat knob to the "*" position. With this setting, the heater will maintain the water temperature at about 10°C. However, if the heater is disconnected from the electrical network and there is a risk of freezing, the water must be drained from it.

Before draining the water heater, disconnect it from the main power supply. Then open the hot water valves on the taps. The water heater is to be drained through the inlet connection.

For this purpose it is recommendable to put a special fitting or a drain valve between the inlet connection of the water heater and the safety valve. If this is not the case, water can be drained directly through the safety valve by putting the lever or screw cap of the safety valve to "Test" position. After draining through the inlet pipe, there is a small quantity of residual water which is to be drained by taking off the heating flange.

The outside of the water heater is cleaned with a mild solution of detergent. Solvents or rough cleaning means should not be used.

By regular service check, impeccable operation must be assured and a long lifetime of the water heater. The first check must be performed by an authorized service workshop after about two years after the first connection. At check, the use of anti-corrosion protecting anode is checked and if necessary, lime scale must be cleaned which, with regard to the quality, quantity and temperature of the water used, is gathered in the inside of the water heater. The service workshop shall after check recommend also the date of the next check of the water heater with regard to the established results.

Never try to repair any possible faults of the water heater by yourself, but inform the nearest authorized service workshop about it.

6 - Test connection 7 - Cup with connection to the outlet H - Cold water T - Hot water

WARNING!