I'm thinking of converting my existing CH system to UFH with warm
The house is a 1930's semi, with 4 rads upstairs, and 3 downstairs,
with heating from a wall hung Potterton Netaheat boiler.
With the exception of the kitchen, floors are boards on joists, and
predominately carpeted (although it is my intension to go to a
wood/laminate surface at some point in the future).
Are there conversion kits from rads to UFH on a per room basis? -and
are they any good?
Should I consider a second boiler just for UFH and retain the existing
for just hot water usage?
What component suppliers would be recommended for a competent DIY'er,
where cost is an issue, but installation hard graft and competence
I know I could trawl the net endlessly for answers, but am hoping that
posting here might sort the wheat from the chaff.
Cheers (and HNY!)
Polyplumb do a an insulation floor panel strip that can be laid over an
existing floor. http://www.polyplub.co.uk The floor level is raised an
inch or so, then laminates cam be put over.
I would install insulation between the joists on the downstairs floors.
This is essential. A condensing boiler is essential as its efficiency is
raised on low temperatures. Look at http://www.heatweb.com for a heat bank.
Why do you want underfloor heating? You could insulate under your wooden
downstairs floors, install triple glazing, install letterboxless highly
insulated doors, make the ceiling air tight to the loft, seal up chimney
breast as flues just draw out hot air and install 1 foot of insulation in
the loft. Then you will not require too much heating at all. Do the calcs
and some skirting heaters may just do the job.
The insulation will keep the house cool in summer too.
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I have installed a full UFH system, if you want to bounce any questions
The key thing is that you will need a way to keep water temp low, new
systems have a thermal store (as mine has) ... you could arrange a temp
blending valve, 3 port 28mm valve.
Then use the output to feed the main UFH distribution manifolds.
Go for a fully pressurised sealed system.
All my parts came from NuHeat, a friend has just installed a system using
PolyPipe which is not too dissimilar.
I am going to put underfloor heating in an barn conversion, could you tell
me do I use a combi boiler (heating and DHW) or use a boiler for the heating
and a multipoint/emersion for the DHW, I will be using oil as a fuel source.
wrote in message >
These are really orthogonal issues.
The issue of whether or not you want a combi boiler has to do with the
amount of hot water production that you need.
Have a look in Google Groups at previous threads on the subject.
Generally for single bathrooms, as long as the water supply is
adequate then a combi *may* produce enough hot water. If it's a
larger property with two bathrooms or simultaneous bath and shower use
then do the sums very carefully.
For UFH you need the heating water at a lower then normal temperature.
To achieve this, either a blending valve is used or a boiler
(typically modulating condensing type able to deliver the lower
temperatures required directly.
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wrote in message
You need to keep the UFH water temp low ... around 30 degrees max ..
typically this is done with a separate pickup coil on the thermal store.
Not experienced using a combi to run UFH ... you would need to use a temp
blending valve to ensure temp is kept below max point.
No, but you do need some mods.
Fisrt of all your CH water will be hotter than is safe for UFH. So you
need probably a temp reduction valve and secobndary circuit. This is why
its not possible to simply replace radiators with loops of underfloor pipe.
Secondly the balancing and zoning is somewhat different on UFH. Its
easier to do this centrally.
www.polyplumb.co.uk, have very good literature, though some of teh pats
are not the cheapest or best.
If at all possible, I would sya that a complete rip up of the ground
floor boards, followed by laying of solid floors over insulation with
embedded water pipes is the optimal way: At first floor level its even
The result, given a decent amount of wall insulation, is totally superb tho.
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