Hi, can I get opinion on whether you think a combi boiler (Vaillant ecotec pro 28) running 9 radiators in a three bedroomed house would be ok with 15mm copper pipework throughout? My rads don't ever get very hot. Advice would be appreciated. Cheers.
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Gas central heating advice - 15mm throughout 9 rad system
- Thread starter julesrules
- Start date
It all depends on the size of the rads!
Traditionally it has been the rule of thumb that 15 mm can only supply 3-4 kW but updating to condensing boiler higher differentials would increase that to 5-6 kW.
A small modern house can easily only have a heat loss of 5-6 kW now.
"Not ever getting very hot" would imply a too low boiler flow temperature or the max CH power is set too low!
Tony
Traditionally it has been the rule of thumb that 15 mm can only supply 3-4 kW but updating to condensing boiler higher differentials would increase that to 5-6 kW.
A small modern house can easily only have a heat loss of 5-6 kW now.
"Not ever getting very hot" would imply a too low boiler flow temperature or the max CH power is set too low!
Tony
Hi, its a large 3 bed house with 2 reception rooms. Longest radiator is a double 9 foot long. 6 are long, and three are square. Soz, I'm not technical at all.
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