Which thermostat has priority on heating system?

jennifernil

andrew-b wrote: »

Jennifer, the problem with your setup is when the programmer is calling for heat from the boiler you will always be heating the pipework enroute to the hall rad and the hall rad itself which isn't as energy efficient as if you had a room stat in the hall. The boiler will remain on until boiler reaches boiler stat temperature (which will be quicker than if all rads are demanding heat)..boiler will cool and then come back on again and the cycle will continue until programmer says turn the lot off.

DvardysShadow..rather than undersizing the hall rad your also missing something .... balancing the system? Backing off the lockshield valve on the hall rad and adjusting other lockshields across the house you can make it such that the other rooms all heat up quicker than the hall so they all reach the set temp on their TRVs with the stat in the hall still calling for heat. The hall rad is then constantly trying to keep up with the rads but is a "marathon runner" with the rads with TRVs on setting the pace. Even on the coldest days the hall rad then gets to full temperature and can still feasibly finish it's "marathon" attempt and relying less on heat losses from the adjacent rooms.

Yes, I do understand the thinking behind fitting a room stat to the system, I just don't feel that it gives enough flexibility in heating the various rooms to the required temperature.

I must read up on this "balancing" stuff.

essexsi_2

Thank you all for your help and discussion. I will have a good read of all the links that have been provided. I have already learnt from your posts so thanks for that.

All the best Si