Hayward H400 install question

[thepoolman1]

Answering this question can involve a lot of liability. You need to do or not do the installation based on your interpretation of the manual or have a pro do it for you based on his/her experience.

[otitis]

I'd say..........check every connection with soapy water with everything open and the heater not running. This will give you an idea if you have any leaks.
Normally, messing around with 10 year old screw fittings, something will need
to be tightened up. The soap and water at each joint and valve will tell you
after you replumb the new unit.

Checking the gas pressure at the gas valve inlet and outlet is a piece of cake if you have the W.C. gauge....

[sniffmo]

That's part of the problem. I don't have the gauge. But since the old heater was installed professionally and was working properly, can I assume that the gas pressure is acceptable?

[otitis]

With mine, when I installed it, it would not light. The gas co. had to increase my meter pressure and flow, by replacing the meter itself.
Since you already had a heater, you should be OK. I did not.