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Thanks Jackthom Will the threads of the Honeywell be the same as the present ones to make a straight change? I note what you say about having a roomstat. How will that work. with all the TRV's and where would be the best place to site it? What about wireless roomstats, are they any good for...

My ch system has been in for 15 years but is serviced regularly. The boiler is a Potterton Suprima 30-80. Honeywell L641A cyl stat; Siemens RWB2 programmer: Landis MA-V322 three port diverter valve. I have no Room stats but each rad has a TRV fitted. I have a problem with the domestic...