From the United States of America? - Checkout our specific plumbing forum for you:USA Plumbing Forum

Discuss Mixing valve broken? in the Water Underfloor Heating Installations area at PlumbersForums.net

Wetroom Store - Official Forum Sponsor
This official sponsor may provide discounts for members
Moved in recently and inherited a combi boiler with 2 zones setup, one to the rads all around the house and a second to the underfloor heating in the kitchen. When the kitchen zone is activated, the boiler kicks in, the flow pipe heats as expected and the heat only travels through the pipework to the kitchen zone. It then gets to the mixer valve for the underfloor heating, where I would expect the heated water to travel through and down into the underfloor heating. This does appear to happen as the pipe below the valve starts to heat up straight away, but the cold side of the mixer valve also heats up instantly. This means the hot water gets part pushed through the underfloor, but also (and I think the majority of it) gets pushed straight back to the return on the boiler. The boiler sees the return get up to temp after about 30 seconds and shuts off.

Am I wrong in expecting that the mixer valve shouldn't be doing this, and that flow across the mixer valve should only be from the underfloor return to be recirculated?

Thanks

Martyn
 
Plumbase - Plumbers Forum Sponsor
This official sponsor may provide discounts for members

Reply to Mixing valve broken? in the Water Underfloor Heating Installations area at PlumbersForums.net. Plumbing questions, answers, tips and tricks.

Wetroom Store - Official Forum Sponsor
This official sponsor may provide discounts for members

Plumbing and Plumbers

Plumbing Workwear

Shower Power Booster

Plumbase Spares - Plumbing Supplies and Spare Parts

Water Underfloor Heating

CORGI Direct for Plumbers

The Wetroom Store

Plumbase Spares

New Posts Threads Members

Top