Questions tagged [expansion-tank]

Questions relating to expansion tanks, which are generally used to compensate for pressure in plumbing produced by water heaters.

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39 views

Expansion Tank on Water Heater horizontal installed

When I check the pressure on my horizontally installed expansion tank, I get a little water coming out as I depress the pressure gauge on the valve. The valve is on the lower side of the tank. Is that ...
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0answers
19 views

Is there a way to relieve the pressure on a model 30 expansion tank without draining the system?

I want to change my Xtrol model 30 expansion tank on my boiler. It is not waterlogged but 15 years old and I'm getting ready to sell the house. Plus the pressure has been going a little higher than ...
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0answers
33 views

How do I test and maintain the expansion tank on my boiler?

I don’t know what maintenance or adjustments are possible on an expansion tank. I understand from the answer to this question that it needs to be "pre charged" to accommodate the range of ...
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1answer
46 views

How can I increase boiler system pressure so bleeding 3rd floor radiators is easier?

It is very difficult to bleed air out of my 3rd floor radiators. I need at least 23 pounds according to the gage on the boiler, and ideally closer to 30 (but not too close!), to speed things up. The ...
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1answer
63 views

How do a boiler’s autofill valve and expansion tank work together as a system?

How do the expansion tank and automatic fill / reducing valve work together in a hot water heating system? It seems to me that if the expansion tank is charged too high the autofill valve will never ...
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2answers
150 views

Trying to plan a pressure-tank + air compressor for raising home water pressure

In my place, the city water system provides the water at pressure of between 2BAR - 4BAR. We live on the 3rd floor, with water boiler on the roof (5th floor) so the hot water are going up to the roof ...
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2answers
32k views

What is the Correct Hot Water Expansion Tank Pressure

What is the correct pressure for the pre-charge on a domestic hot water expansion tank? I have read in several places that it should be pressurized for the incoming water pressure. This would ...
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0answers
214 views

Correct installation of a water expansion tank?

I am moving my 80 gal water heater to a better location in my basement to give shorter hot water plumbing runs and be next to my furnace. The old expansion tank was installed in "series" ...
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3answers
26k views

After installing expansion tank, massive buildup of pressure then a trickle?

I am completely stumped. You guys helped me out a lot with my previous question here: What could be causing water to drip from the relief valve of my new gas water heater? Turns out the expansion ...