- Joined
- 15 Jul 2024
- Messages
- 3
- Reaction score
- 0
- Country
I have a somewhat unusual challenge…
My underfloor heating system has been designed for a 60 degree flow temperature solely to satisfy the heat demand of a single double-height large room. In reality we have been running it at 50 degrees because that is enough except on the coldest days. It is a rather old fashioned design with one thermostat per room which works ok, but is not very efficient.
The maximum heat loss in the “coldest” room is above 100 watt per square metre, in most other rooms it is 60-80watts per square metre. The system covers 12 rooms and has four manifolds, all driven by a central pump from a condensing gas boiler.
We are now insulating the house and are upgrading the floor system in stages, which will in the first instance reduce the heat loss in four rooms to around 30 watts per square metre and these could easily be run with a flow temperature of 35 degrees and a proper weather compensated control. We would really like to do that to reduce cycling and get rid of all individual thermostats on that floor. In the long run as we insulate the other parts of the house we would give every room the same treatment, but this won’t happen before the next heating season.
How can we reduce/manage the flow temperature for a single manifold? I know that manifolds with blending valves come with a pump, but we have one central pump for the whole system. I don’t think just adding a blending valve to the manifold would work, or would it? If we use a manifold with pump, do we have to convert all manifolds?
My underfloor heating system has been designed for a 60 degree flow temperature solely to satisfy the heat demand of a single double-height large room. In reality we have been running it at 50 degrees because that is enough except on the coldest days. It is a rather old fashioned design with one thermostat per room which works ok, but is not very efficient.
The maximum heat loss in the “coldest” room is above 100 watt per square metre, in most other rooms it is 60-80watts per square metre. The system covers 12 rooms and has four manifolds, all driven by a central pump from a condensing gas boiler.
We are now insulating the house and are upgrading the floor system in stages, which will in the first instance reduce the heat loss in four rooms to around 30 watts per square metre and these could easily be run with a flow temperature of 35 degrees and a proper weather compensated control. We would really like to do that to reduce cycling and get rid of all individual thermostats on that floor. In the long run as we insulate the other parts of the house we would give every room the same treatment, but this won’t happen before the next heating season.
How can we reduce/manage the flow temperature for a single manifold? I know that manifolds with blending valves come with a pump, but we have one central pump for the whole system. I don’t think just adding a blending valve to the manifold would work, or would it? If we use a manifold with pump, do we have to convert all manifolds?