That would depend on the boiler - look on the boiler plate it will tell you the answer for that boiler there.
Do you mean how many watts are used to make hot water? It varies, but a typical home electric hot water heater consumes about 4,500 watts. Industrial hot water heaters might use 20,000 watts or more! I have a little warmer that keeps my coffee warm as I type this, it consumes about 300 watts. Of course it only heats 6 ounces of water....
A typical home hot water heater uses 4800 watts. The circuitry connecting to the tanks is a 20 amp breaker with #12 wire for the connection. The tank draws 20 amps. W = A x V = 20 x 240 = 4800 watts. Some industrial hot water tanks can be rated at four times the size of home tanks.
Different 240 volt watt water heaters use different amounts of watts! Look at your water heater. It should have a plate that lists the watts! On the other hand, the water heater only uses watts when it is heating water. If the family uses paper plates and takes brief showers by getting wet, turning off the shower, applying soap, and then rinsing, it will use a lot less electricity than if every member of the family runs out the tank of hot water taking a hot shower every day.
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A boiler service is where people who specialize in fixing hot water heaters come out and service your hot water heater. They make sure everything is working correctly.
The GE water heater SE50M12AA01 is a 5500 watts or 5.5 Kilowatts water tank. The amperage on such a tank is I = W/E. Amps = Watts/Volts. Since most hot water tanks in North America use a voltage of 240, the amps will be 22.9 amps. It must be fed with a #10 conductor from a 30 amp breaker.
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VOLTS x (VOLTS/OHMS) = WATTS 240 X (240/8) = 7200 Watts = 7.2KWatts
Assuming you are referring to a 240 volt residential hot water heater you will need to install 10/2 NM cable (Romex) with ground from the service panel to the water heater wired to a 30 amp circuit breaker in the service panel. If you cannot see the water heater from the service panel you will need to install a service disconnect at the water heater.
Either too hot of an environment or too many watts going to them.
It uses as many as you run through it, but who would want to heat hot water?
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