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The overheat unit on my Radiation boiler keeps cutting in and off goes the boiler. On resetting the boiler and unit all is ok again for maybe a week or so then off it trips again. The only way I can keep it running is to lower the boiler temp. thermostat. The higher it's set the sooner the...

I wish to change my old Radiation boiler to a new Vaillant System boiler (not a combi) Can someone please explain the difference between the "sealed" and "open vent" systems on offer. And are there any advantages or disadvantages over either . My present system has 7 rads, a combined hot...

It finally looks like the end is near for my 25yr. old Radiation Fuelsaver 15RS. The pilot light is begining to become unreliable and I think I've traced the problem to the "overheat thermostat". Can anyone recommend a "condenser" boiler make as a suitable replacement. Having seen and...