Boiler solely for underfloor heating circuit

[Matt0029]

Has anyone ever fitted a gas/lpg or oil boiler solely for underfloor heating? Piped up to a manifold.

 

[Scott_D]

No but I cant see it being an issue.
Low flow temp and sized correctly

 

[IND_Nick]

We fitted a Baxi 825 onto a ground floor system of a larger 3 storey house. It did the UFH, approx 110sqm and also utility/downstairs wc taps. Check with Baxi beforehand and they were happy with the installation. From memory the system was split into 4 zones, each approximately 5kw. Been in for a couple of year and boiler is like new on the annual service. My main concern was if it would modulate low enough but appears fine and flow temp set for about 48 degrees constantly.

 

[Matt0029]

Thanks was wondering whether it would be better with a heat only or system boiler in this situation. The underfloor heating manifold would be very near to the boiler, would the pump in that be enough. Then add expansion and a prv.

 

[IND_Nick]

You would have to check with the UFH supplier I would imagine they would be against it though as almost every system I have seen has a control unit that incorporates the mixing valve and pump all in one. System boiler may do it as PRV and expansion already sorted, although you would have to check expansion capacity again UFH volume.