Hi, I have 2 double rads that struggle to get more than ‘tepid’ when the heating is on. Boiler is a Vaillant ecotec plus 831, I think it’s probably undersized but these two rads don’t get hot even when most of the other rads in the house are turned off. Boiler flow temp set to 75C.
Lockshield valves were already fully open, I tried replacing them and the TRVs, but that didn’t make any difference at all.
The rest of the house has copper piping for the heating, except these two rads which are done in 15mm plastic (I think they were done with the kitchen...). I had put it down to the slightly smaller bore of plastic pipe and it not being enough to get good flow to the two double rads, however I decided to remove a cabinet and panel and investigate further, see pics below.
I was expecting flow and return, but there’s a bonus 3rd pipe sticking out of the concrete floor! In the pic with the plastic pipes the top pipe is flow, the very bottom pipe is gas and the one above that is return. Then there’s a surprise bonus 3rd pipe that the return of the two double rads is connected to.
Does anyone have any idea why there would be 3 pipes like this? Do you think moving the plastic return to the lower pipe would sort out the two tepid rads?? Any advice very welcome!
Lockshield valves were already fully open, I tried replacing them and the TRVs, but that didn’t make any difference at all.
The rest of the house has copper piping for the heating, except these two rads which are done in 15mm plastic (I think they were done with the kitchen...). I had put it down to the slightly smaller bore of plastic pipe and it not being enough to get good flow to the two double rads, however I decided to remove a cabinet and panel and investigate further, see pics below.
I was expecting flow and return, but there’s a bonus 3rd pipe sticking out of the concrete floor! In the pic with the plastic pipes the top pipe is flow, the very bottom pipe is gas and the one above that is return. Then there’s a surprise bonus 3rd pipe that the return of the two double rads is connected to.
Does anyone have any idea why there would be 3 pipes like this? Do you think moving the plastic return to the lower pipe would sort out the two tepid rads?? Any advice very welcome!