Help UFH floor sensor routing, how?

[SpecialK]

UFH isn't something you blast on and off like rads..

I do with mine!

 

[Deleted member 281264]

My UFH runs at 25c flow temp and keeps the room at a lovely comortable temperature

UFH with a rubbish TMV at the manifold is very outdated tech now, it should be designed with an electronic mixing valve

If blasting UFH you are doing it wrong, floors should not be too hot it should be a slow constant temperature

 

[SpecialK]

My UFH runs at 25c flow temp and keeps the room at a lovely comortable temperature

UFH with a rubbish TMV at the manifold is very outdated tech now, it should be designed with an electronic mixing valve

If blasting UFH you are doing it wrong, floors should not be too hot it should be a slow constant temperature

Works fine. Maybe you are doing it wrong! I don't want my boiler cycling all day long.

 

[Deleted member 281264]

My boiler runs at 40c flow temp on the boiler

Radiators at 35c, UFH 25-30c

If you have a TMV at the manifold you are sending hot 70c water from the boiler down to the manifold and it's being blended down, my boiler sends 30c water straight to the underfloor heating, controlled by weather compensation and much more efficient, while ironically yours will be cycling much more. It only reaches a flow temperature above 60c when the cylinder calls for heat, then back down to 40c.

 

[mattwaddy]

plan was to have a flow temp of 45 degrees set on the manifold, hopefully bring temp down to 55 ish on the boiler as we still have upstairs rads. I've been told to not let the floor exceed 27 degrees, but not sure how low I can get away with on the manifold until I run it, pipes are going to be 150mm centers

 

[Deleted member 281264]

45c is high. You have much more insulation than me and I have 200-250mm centres and I can run my UFH at 35c when it's -1 outside

You are doing a new install so design it as a low temperature system. It's also part of the new building regulations as well.

What boiler are you going for?

 

[SpecialK]

plan was to have a flow temp of 45 degrees set on the manifold, hopefully bring temp down to 55 ish on the boiler as we still have upstairs rads. I've been told to not let the floor exceed 27 degrees, but not sure how low I can get away with on the manifold until I run it, pipes are going to be 150mm centers

It all depends how you want to run it. I don't want mine at a low temp all day as it's a waste due to the house being unoccupied. I also have the upstairs rad on the loop for the UFH to act as a buffer otherwise the boiler cycled even more. My boiler flow temp is set to 55 as I also have rads on the other loop.

Pumping 40 degrees through it this evening took the slab from 18.6 degrees to 26 degrees in about 1.5 hours.

 

[Deleted member 281264]

It all depends how you want to run it. I don't want mine at a low temp all day as it's a waste due to the house being unoccupied. I also have the upstairs rad on the loop for the UFH to act as a buffer otherwise the boiler cycled even more. My boiler flow temp is set to 55 as I also have rads on the other loop.

Pumping 40 degrees through it this evening took the slab from 18.6 degrees to 26 degrees in about 1.5 hours.

Wrong again, heat pumps are designed like this to be on constantly at low temp for efficiency. The same can be acheived with a gas boiler

The idea is to be constantly matching the lost heat from the building and keeping things stable rather than fluctuations. Weather compensation makes a property much more comfortable

You could have heating on constantly at low temperature with no super hot uncomfortable floor all while saving 5-10% on your bills and prolonging the life of your boiler

 

[SpecialK]

Wrong again, heat pumps are designed like this to be on constantly at low temp for efficiency. The same can be acheived with a gas boiler

The idea is to be constantly matching the lost heat from the building and keeping things stable rather than fluctuations. Weather compensation makes a property much more comfortable

You could have heating on constantly at low temperature with no super hot uncomfortable floor all while saving 5-10% on your bills and prolonging the life of your boiler

Ha ha