Recent content by chrisbeney

No, the flow rises to the loft with no branching on the way at all. In the loft it runs nearly horizontally with four downward branches. Each branch goes down to under the ground floor, passing a rad on first and on ground floors (except in one case where the first floor one is omitted). These...

Thanks 'doitall', that is an encouraging reply. Flow pipe is known, there are two returns, one into each bottom side of the existing boiler, would need linking into one of course. Cold feed goes to one of the return pipes just before the boiler, so could probably stay there. Vent pipe...

I have a full truly all-gravity system: 2 1/2 inch iron flow pipe, cast iron radiators, no pump, no electrics whatever, no hot water (currently separate electric system for that). Apx 100,000BTU/hour, 45kW Ideal gas boiler. Works fine. Goes to attic with 2 1/2 inch pipe and then branches down to...