hi my plumber has run 15mm pipework from 1st floor to ground floor which then feeds 4 rads all doubles 2 * 1000*600 1 1200*600 and 1 1400*600 is this acceptable or should it be 22mm ? any advice would be great.
thanks i'ma bit concerned because the rad on the end of the run is a 1400 by 600 double and we have to have it on max to get it warm sorry forgot to say its a combi vailliant 837
boiler was fitted downstairs with pipework running up to first floor with 22mm pipe for about 1 metre then all rads upstairs and downstairs come from 15mm 10 in total. he has agreed to change upstairs to 22mm but says the feed downstairs in 15 is fine I just want to make sure he gets it right this time.
By doing a total of the output of all the rads on this part of the system, I would say that 15mm is undersized. I would definitely have done it in 22mm.
The output of the 4 rads comes to approx 26,000 BTU, and 15mm is only really good for 15,000 BTU. Therefore, you may struggle to get them to heat up properly.
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