D
D-Ireland
Hi all, new to the forum so any help very much appreciated. Let me apologise for the length of the post!!
We live in a bungalow with 10 existing radiators, some single, some double.. Existing boiler is a 50/70 oil boiler. We recently had a new extension built with 3 double radiators installed. The plumber initially ran a 15mm feed and 15mm return pipe off the existing 15mm pipes which were supplying the exiting kitchen radiator. While the existing rads were still heating up as well as ever, the rads in the extension were getting only lukewarm. Its quite a big space, about 480sq feet in total with vaulted ceilings, so if the rads aren’t at full heat it’s not going to heat up.
The plumber then brought a 22mm pip from the main 22mm pipe into the extension and then ran the 3 new rads off this using the 15mm pipes he had already laid (and were now screeded over). This improved things but not significantly.. He then installed a different (used) pump and reversed the flow to rule out a pump fault. Again there was some improvement but the new rads are still nowhere near as hot as the radiators in the rest of the house. Another issue was that the thermostatic valves (these are only installed on the new rads and not the old ones) seemed to be kicking in and shutting down the rads which would suggest the heat was getting to the feed pipes ok. We have removed the valves in the short term. The plumber has balanced the rads.
The builder and plumber are thinking the boiler may not be big enough/working well, but I would have thought this would result in a drop in heat for all rads and not just the new ones which makes me think it’s a circulation/piping issue? The existing rads are piping hot. Has anyone got any advice? In fairness to the plumber he has been working hard to get it sorted. If you need further info please let me know! Many thanks.
We live in a bungalow with 10 existing radiators, some single, some double.. Existing boiler is a 50/70 oil boiler. We recently had a new extension built with 3 double radiators installed. The plumber initially ran a 15mm feed and 15mm return pipe off the existing 15mm pipes which were supplying the exiting kitchen radiator. While the existing rads were still heating up as well as ever, the rads in the extension were getting only lukewarm. Its quite a big space, about 480sq feet in total with vaulted ceilings, so if the rads aren’t at full heat it’s not going to heat up.
The plumber then brought a 22mm pip from the main 22mm pipe into the extension and then ran the 3 new rads off this using the 15mm pipes he had already laid (and were now screeded over). This improved things but not significantly.. He then installed a different (used) pump and reversed the flow to rule out a pump fault. Again there was some improvement but the new rads are still nowhere near as hot as the radiators in the rest of the house. Another issue was that the thermostatic valves (these are only installed on the new rads and not the old ones) seemed to be kicking in and shutting down the rads which would suggest the heat was getting to the feed pipes ok. We have removed the valves in the short term. The plumber has balanced the rads.
The builder and plumber are thinking the boiler may not be big enough/working well, but I would have thought this would result in a drop in heat for all rads and not just the new ones which makes me think it’s a circulation/piping issue? The existing rads are piping hot. Has anyone got any advice? In fairness to the plumber he has been working hard to get it sorted. If you need further info please let me know! Many thanks.
