Polypipe retro-fit wet underfloor heating

[BlueHair]

Hi there

My first post on this section, we about to embark upon a scarily large extension, so it won't be my last!

The system is laid on top of wood or concrete flooring and is only 18mm in depth -including all necessary insulation. Is it too good to be true, has anyone any experience of it?

It does work fine, it is a good system. Don't forget that the insulation is only there to prevent heat loss underneath the pipes and provided you have sufficient flow from your boiler, it will be fine.

John Guest also do an excellent retrofit system.

In my experience the wet kits are far superior to the electric heatmat type systems

Will have a look at the John Guest system. Thank you!

Hi there,

If you haven't already make sure to check out electric underfloor heating. It is only 2mm high, just as efficient as hydronic underfloor heating and the startup system cost is much lower.

All the best.

Interesting stuff underfloorheating but slightly misleading. Electrical ufh may be as energy efficient as a wet system but given electricity costs three times as much as gas per kwh, the electric system would need to pump out three times as much heat per kwh to make the two systems cost equivilent in the long term. Which is impossible.
If I've misunderstood you, apologies and I look forward to seeing a link to an independent study backing up your claims.

It is true that, in terms of set up, electrical systems are cheaper, but they will cost a lot more in the long term.

The key really is to make sure that your existing boiler is big enough to run additional UFH or you could find yourself disappointed

also worth saying that John guest will come out themselves at no cost to you and do a full specification on a proposed system and advise if your existing boiler is suitable. In my experience, Polypipe tend to be less helpful

We have to buy a new boiler - in fact we need a completely new central heating system. Choice of boiler will be dependant on it's ability to deal with several bathroom rooms and underfloor heating throughout the house.

If you want to pm me with your rough location I may be able to direct you to the right person