The Efficient Home Forum

I'm having a Geocell (recycled foam glass insulation) + Limecrete floor installed in my 1920's house, with Underfloor Heating embedded in the Limecrete. When I requested a quote from Nu-Heat I said I wanted to use my existing Evohome system (and that I would provide the room thermostats and the "wiring centre" -- their term), they came back saying that because I was planning to install engineered wood flooring, that there needed to be an embedded floor sensor so that the floor temperature would never exceed 27 degrees or the floor warranty would be void.

1) I've never heard about an embedded floor sensor, is this just Nu-Heat covering their behind in case they get sued if the flooring is heat-damaged?
2) Does Evohome have such a thing as this "floor sensor"?

According to the Nu-Heat guy on the phone, from the wireless wall-mounted Nu-Heat thermostat, there's a wire (buried in the wall) going down to the floor, with a sensor embedded in the limecrete (so I guess if the sensor ever fails I'm in trouble) to ensure that the floor temperature never exceeds 27 degrees. My question of "what happens if the room isn't warm enough but the floor temperature is at 27, does that mean the UFH gets switched off?" did not receive a satisfactory answer. I thought the floor temperature was handled by a thermostat at the manifold, but this guy was adamant that was not the case.

So, general question: do I need to find a different UFH company? Does Evohome support this at all? And more generally please: what have others installed when going for UFH embedded in limecrete/screed/concrete with engineered wood flooring, and how has your Evohome system handled it?

Thanks!!

So firstly, evohome doesn't have floor sensor provision with HCC80R. If you want or need floor sensor protection, then you would need to use a third party floor sensor and high limit wired into the relevant thermal actuator(s).

All depends what floor temp capability is and design behind it. Floor probes are more common with electric UFH than with hydronic UFH, but some people do fit them (backend protection to a certain extent).