I’m currently sizing some additional radiators for an existing central heating system (all rad’s have TRV’s) that has a non condensing combi boiler that’s around 8 years old. The new radiators will be fitted in the next few weeks but I’m planning on changing my boiler in a year or so.
Am I correct in assuming that radiators that are served by new condensing boilers should be calculated using delta_ T50, and delta_T60 should be used for non condensing boiler systems? If so then I believe I have to buy radiators that have too large a capacity for my current boiler in anticipation of fitting a condensing boiler that runs at a lower output temperature.
For example - for a calculated room requirement of 4110 Btu, a radiator of Btu/h 4587 at delta_T60 should suffice for my current boiler. When I then change to a condensing boiler, I believe that this radiators capacity reduces to an output of Btu/h 3620, thereby not providing sufficient heat for the room.
I’d appreciate if someone could confirm (or otherwise) the above assumptions before I buy inappropriate radiators.
Thanks in advance.
Antony
Am I correct in assuming that radiators that are served by new condensing boilers should be calculated using delta_ T50, and delta_T60 should be used for non condensing boiler systems? If so then I believe I have to buy radiators that have too large a capacity for my current boiler in anticipation of fitting a condensing boiler that runs at a lower output temperature.
For example - for a calculated room requirement of 4110 Btu, a radiator of Btu/h 4587 at delta_T60 should suffice for my current boiler. When I then change to a condensing boiler, I believe that this radiators capacity reduces to an output of Btu/h 3620, thereby not providing sufficient heat for the room.
I’d appreciate if someone could confirm (or otherwise) the above assumptions before I buy inappropriate radiators.
Thanks in advance.
Antony