Search: Posts Made By: Furd
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Replies: 17
Views: 2,442
Posted By Furd

The expansion tank is usually the cause of...

The expansion tank is usually the cause of excessive pressure excursions but there are other things that could cause excessive pressure so it is necessary to look at all the possibilities. Glad the...
Replies: 17
Views: 2,442
Posted By Furd

You wrote that the boiler mounted gauge read...

You wrote that the boiler mounted gauge read about five psi below the "accurate" gauge you connected to the drain. Then you wrote that the boiler gauge read 28 while the accurate gauge read 25.
...
Replies: 17
Views: 2,442
Posted By Furd

If you have a leak in the domestic water heating...

If you have a leak in the domestic water heating coil AND your domestic water pressure dropped below boiler pressure then you could have a backflow that way.

Yes, please get an accurate pressure...
Replies: 17
Views: 2,442
Posted By Furd

Do you have a well or are you on city water? ...

Do you have a well or are you on city water? What is your domestic water pressure?

The tankless coil may have a pinhole leak and if so the domestic water would be leaking into the boiler water. ...
Replies: 17
Views: 2,442
Posted By Furd

I'll go along with the others and state that this...

I'll go along with the others and state that this is about the worst time of the year to be doing major work on a heating system unless you have absolutely no choice.

Your statements on how this...
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