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also i forgot to say each room has a programable stat. not that that got a lot to do with what i am asking. thanks

he's been trying to find out too. he left it at 55 but says he will try & find out the most economical temp to set it to. no sure what you mean by a blending valve unless you mean the thermostatic control valve that has a brass probe inserted just before the manifold.

hi, i was wondering what the most efficient/optimum temperature for my new glow worm ultracom 2 30cxi would be set at for working with my new underfloor heating system. i have no radiators to worry about. is it lower the better or is there a best temp range to keep it in for the condensing to...