What are these about then? they go on the hw tank? Should we be using them here?NT

Heat traps?

Jan 21, 2007 3 Replies

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David Hansen

On 21 Jan 2007 03:27:20 -0800 someone who may be wrote this:- The arrangement of connections to a UK hot water cylinder limit the amount of gravity circulation of hot water.

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meow2222 19 years ago

What are these about then?

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they go on the hw tank? Should we be using them here?

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Information here may be outdated?

David Hansen 19 years ago

On 21 Jan 2007 03:27:20 -0800 someone who may be snipped-for-privacy@care2.com wrote this:-

The arrangement of connections to a UK hot water cylinder limit the amount of gravity circulation of hot water.

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Aidan 19 years ago

then?

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...>> Do they go on the hw tank? Should we be using them here?

You might need them on some installations, e.g., serving secondary heating zones.

One I had was a thermal store serving a HWS storage cylinder & with a mid position valve. The mid-position valve was normally open to the HWS with the power off; gravity circulation caused the HWS to overheat. It wouldn't happen with a simple boiler, because there's little heat stored.

I fitted a swing-check non-return valve to stop it. No effect at all. With hindsight, should have been a spring check NRV.

Changed the 3-port Y plan to 2 off 2-port zones S-Plan valves, both normally closed; problem solved.

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