Discuss Potterton profile 80e to Vaillant ecotec plus 430 in the Plumbing Jobs | The Job-board area at PlumbersForums.net
30Kw is a quite a big boiler, so must be quite a big system...
We had issues with the old style Vaillant 428 where it was fitted to a large system, almost at its limits (apparently). We had 22mm flow and returns from the boiler, to pump, zone valves etc. Had some circulation issues, and the boiler would run a bit strange, stayed on low burner most of the time. Changed the max output to 20Kw and it worked perfect! So worth checking out pipe sizes, Vaillant told us their 28Kw open vent boiler MUST be piped in 28mm to at least the zone valves, although they leave this out of the installation manual! :thinking:
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