Kelvinator KGC20BLA, User Manual

6  how it works  

Kelvinator gas continuous flow hot water systems

When a hot water tap is turned on, cold water begins flowing 
through the gas continuous flow hot water system and out 
of the hot water tap. A flow sensor inside the water heater 
detects that there is water flow and the computer opens the 
internal gas supply valve, ignites the burner and starts the 
internal fan. The water circulating inside the water heater 
goes through a heat exchanger that absorbs the heat created 
by the flames of the burner and transfers the heat into the 
water circulating through it. The internal computer modulates 
the gas supply valve and the water flow to produce the right 
amount of hot water to the correct temperature. When the 
hot water tap is turned off, the unit detects that the water 
flow has stopped and closes the gas supply valve, stopping 
the burner. The internal fan continues to run for a little while 
longer and then shuts down.
Your gas continuous flow hot water system may be installed 
on its own or part of a gas boosted solar hot water system. 

Turning on your gas continuous flow hot water system

If your gas continuous flow hot water system has been turned 
off after commissioning or shut down for a period of time 
follow these instructions: 
•  If the system has been drained, ensure that the drain plugs 

have been screwed back in place (hand tighten only)

•  Open any hot tap or fixture in the house
•  Open the cold water isolation valve located on the inlet to 

the water heater

•  Once water is flowing freely from the open hot tap or 

fixture, indicating that all air has been dispelled from the 
system, close the open hot water tap or fixture

•  Open the gas isolation valve located on the inlet to the 

water heater

•  Plug in the power cord to the power outlet (if it isn’t 

already) and turn on the power supply to the outlet.

•  Turn on the remote controller (if fitted) by pressing the 

ON/OFF button and press the PRIORITY button

Your gas continuous flow hot water system is now ready to be 
used and will operate automatically when a hot tap or fixture 
is opened.

Turning off your gas continuous flow hot water system

If you wish to turn off your gas continuous flow hot water 
system follow these instructions:
•  Turn off the remote controller (if fitted) by pressing the 

ON/OFF button

•  Switch off electrical supply at the power outlet that the 

water heater is plugged into

•  Close the gas isolation valve located on the inlet to the 

water heater

•  Close the cold water isolation valve located on the inlet to 

the water heater

Note: If there is a risk of freezing conditions, do not switch off 
power to the water heater unless it is drained of water first. 
Please see the section on freeze prevention on page 9 of this 
manual for more information.

Your gas continuous flow hot water 

system – how it works

Exhaust

Burner

Fan

Computer 

Board

AC240V

gas

cold water inlet

hot water outlet

thermistors

flow sensor

gas 

valve

heat 

exchanger