by derek »
Sun Feb 17, 2008 4:42 pm
Single pipework systems can be still be retained with some modern condensing boilers (always best to check with boiler manaufacturer), but to ensure boilers condense efficiently, the flow and return differential temperature must be 20 degrees (i.e 70 degrees flow 50 degrees return).
Should a single pipe system be used, this return differential cannot be guaranteed and the efficiency of the boiler could be adversely effected.
Best practice and boiler interlock under part L Building regs require a Programmer/Room stat and thermostatic radiator valves to be fitted for control of the boiler/reduced emissions.