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18

Gas pressure checks are done with flowing gas using 

a gas pressure gauge capable of reading pressure in 

inches of water column. 

• 

Supply gas pressure checks are measured before 

the gas control valve/thermostat and as close to 

the water heater as possible.

• 

Manifold (main burner) gas pressure is measured 

at the pressure tap on the bottom of the gas 

control valve/thermostat. Use an Allen wrench to 

remove the plug then attach the gas gauge. 

NOTE: Desired gas pressures will be noted on the 

gas valve label located on the gas control valve/

thermostat.

 

supply gas pressure is under desired pressure 
requirement

• 

increase supply gas pressure regulator setting 

and,

• 

increase supply gas piping size.

supply gas pressure is over desired pressure

• 

add gas pressure regulator.

• 

reduce setting on existing regulator.

manifold gas pressure is more than +/- .3 inch 
W.C. from values indicated on gas valve

ensure there is adequate supply gas pressure

• 

e

• 

nsure the main burner orifi ce is the correct size 

for the water heater model being tested.
if the above tests have been performed and the 

• 

results were correct replace the gas control valve.

The Installation Instructions and Use & Care Guide 

gives guidelines under “Air Requirements” and 

“Unconfined “ or “Confined Space” sections. If you 

want to test for a lack of air:

1.   Turn on every appliance and fan that exhausts 

air from the utility room and/or house. Make 

sure all windows and doors are closed, as well 

as chimney dampers.

2.   Open a hot water faucet so that the main 

burner will ignite

3.   Remove the outer door of the water heater – 

not the inner door

4.   Monitor the flame characteristics for several 

minutes

If the flame begins to “yellow” open a door or window, 

to the outdoors, to see if additional air corrects this 

back to blue. If it does, the room needs more air 

supply.