one plumber says i need need 2, the other 1. i have UFH in the kitchen running off a combi. the system has its own flow/return feed to boiler. any ideas why there are 2 answers and which one is right. or are both answers right.
i'd probably guess at one valve closing the rad side of heating and the other the ufh. so if you want either on or off you will need 2 mzv one for each side
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