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 ...
My existing (old) CH system uses a single pipework loop downstairs and a single pipework loop upstairs - ie the radiators are in series with the pipework rather than in parallel as modern systems. I am told that you cannot use this arrangement with the new high efficiency condensing boilers and that...
