We have a 4400 and this is our second winter with it.
Works great once you get the boil overs from air leaks figured out.
Extremely happy with it .
One problem ,,,
It is supposed to heat our hot water in the HWT. Via some pex and a heat exchanger.
We get luke warm water out of it, not hot enough to take a shower really.
We lived with it last year and turned on the electrics when we had company.
I now find out that we should be getting hot, not warm, water out of the system.
The installer says it’s plumbed right, as he’s done 200 of them.
We are waiting for him to come out and have a look[ 3 weeks]
We are on a well with 40 psi pressure at the tank.
The water gets good and hot with the electrics on.
But luke warm otherwise.[Trying to post some pics ]
Anybody else run into this?
Any ideas?
O ya the fan goes off at 170 and kicks on at 160 .
Is this too low???
Thanks
kenny