Mar 9, 2008, 10:46 AM
Post #9 of 10
As a side note, I have maintained these on demand heaters. One of the biggest mistakes made, which will give you fits, is that the vents have to be installed properly and with the correct size. If not, the heat exchangers will soot up and shut off.
It's a hassle to pull the heat exchanger and clean them. The vent pipe should be at least 6" in diameter and go STRAIGHT up...no elbows. Clean water, free of particulates helps, the correct pressure as noted but when all the ducks are in a row, they work fine.
Oh yea, one more: Make sure the piping is the correct size. Many plumbers tend to undersize the copper.
Hope that helps.