girard 2 tankless water heater
I have a girard 2 water heater. it was installed feb./19. it worked flawlessly till about a couple months ago. now what happens is that it will not reach preset temp (47 degrees Celsius)it will get to about 44 then it starts dropping then back up then down again. my water flow thru city connection is 1.1 gpm and thru water pump is 1.01 gpm.
thank you in advance