Plumbing question: should feed and expansion tank be covered?

VerdantValley · 17-10-2017 04:46PM #1

Should the feed and expansion tank in the attic be covered?

I can think of 2 reasons why it should be:

to reduce the amount of water vapour that escapes;
to prevent insects and other debris falling into the tank.

VerdantValley · 17-10-2017 07:38PM

In case it's not clear: I am soliciting people's opinion.

It may seem like I have answered my own question; but actually, I want to know all the pros and cons.

DublinDilbert · 17-10-2017 07:43PM

VerdantValley wrote: »

In case it's not clear: I am soliciting people's opinion.

It may seem like I have answered my own question; but actually, I want to know all the pros and cons.

No real cons... I usually get some insulation pir board to make the lid, its foil sided for damp and will insulate the tank too

bonzodog2 · 17-10-2017 10:16PM

You want it covered but not airtight. If you covered it with plastic sheet and ran a bath it would suck the plastic down

my3cents · 18-10-2017 11:01AM

I just covered two tanks we have. Used a couple of corrugated plastic election posters cut to fit.

18-10-2017 12:43PM

If you cover the tanks you might need to lengthen the expansion pipe.

I've seen people drilling a 25mm hole in the plastic lid expecting the water from expansion pipe to flow into the hole. In reality the expansion pipe can move violently from the pressure.

The expansion pipe should go into the hole in the lid by a few inches but still needs to be well above the water level of the tank

Plumbing question: should feed and expansion tank be covered?

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