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I've got Vaillant weather comp on an oversized 637 boiler. The low flow on rads works really well using the vaillant controls, but the UFH is still on on/off controls via the heatmiser. I think the UFH would benefit from vaillant controls an constant flow temp rather than on/off as it currently...

Hi, I recently had the Vaillant weather comp VRC720f and VR71 fitted to my hot water tank, radiator circuit and UFH downstairs (run via heatmiser). My aim is to run the boiler on modulation at a low temperature. I've figured out I can heat the home well on a minus temp day at a flow temp of 45...

Hi. A bit late but had the vr71 installed yesterday with same problems. Probes not attached to anything so flow temps been crazy high. Struggling to speak to anyone who can help as installer not 100% on it either!