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Getting Underfloor working properly.

hurlerman · 2009-11-10 09:41:28

I have a gas powered underfloor heating system for a year but I'm not too impressed with it's performance. I usually set it to come on for 2 hours, which initially used to do the trick for heating but now barely gets the room temp up to 16-18c. Some spots on the floor are warm and others are cold. And it's flying through…

10-11-2009 10:41am

#1

hurlerman

Closed Accounts Posts: 18 ✭

Join Date: March 2007

Posts: 12

I have a gas powered underfloor heating system for a year but I'm not too impressed with it's performance.

I usually set it to come on for 2 hours, which initially used to do the trick for heating but now barely gets the room temp up to 16-18c. Some spots on the floor are warm and others are cold. And it's flying through the gas even though I have a condensing boiler.

I've heard underfloor should be on almost constantly - Is that true? If I tried that I'd be getting a gas tank refill every week I'd say.
The little flow valves on the manifolds - I've tried tweaking them, to adjust the flow to rooms - to no great effect. They're usually around 0-2 (litres is it?).. I'm not sure what the norm is?

Then I saw that oxyvent system, yer man in kerry was on the telly with it I think, and it claims to improve performance by 50%!

Just looking for some general advice, thoughts - before going to the plumber who I don't think has a clue.

0

Comments

#2 10-11-2009 9:17pm

mr_edge_to_you

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http://www.boards.ie/vbulletin/showthread.php?t=2055621243

http://www.boards.ie/vbulletin/showthread.php?t=2055632848

2 of many threads on the topics. all of the posts seem to suggest that UFH operates most effectively with a heatpump giving a constant more ambient heat.

2 hours doesn't sound like its long enough for a floor to heat up.

0
#3 11-11-2009 1:23pm

John mac

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Join Date: August 2001

Posts: 4942

hurlerman wrote: »

I have a gas powered underfloor heating system for a year but I'm not too impressed with it's performance.

I usually set it to come on for 2 hours, which initially used to do the trick for heating but now barely gets the room temp up to 16-18c. Some spots on the floor are warm and others are cold. And it's flying through the gas even though I have a condensing boiler.

I've heard underfloor should be on almost constantly - Is that true? If I tried that I'd be getting a gas tank refill every week I'd say.
The little flow valves on the manifolds - I've tried tweaking them, to adjust the flow to rooms - to no great effect. They're usually around 0-2 (litres is it?).. I'm not sure what the norm is?

Then I saw that oxyvent system, yer man in kerry was on the telly with it I think, and it claims to improve performance by 50%!

Just looking for some general advice, thoughts - before going to the plumber who I don't think has a clue.

2 hrs is not long enough.
when you say tweaking them do you know what the thermostat is set to ?

you have un balanced the system by doing that and now more water is being circulated to one particular area . thats why you are getting hot and cold spots.

Get a plumber in. he will have to re ballance the whole thing. EDIT(if you Have no confidence in your original plumber get another one)

underfloor heating is not the same as rads. and cant be treated the same.

0
#4 12-11-2009 1:05pm

yop

Moderators, Home & Garden Moderators, Regional Midwest Moderators, Regional West Moderators Posts: 16,724 Mod ✭✭✭✭

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The cold spots might success air in the UFH????

I know ours (was a self install) was full of air and I had to drain it and fill it right It made all the difference.

0
#5 12-11-2009 9:37pm

hurlerman

Closed Accounts Posts: 18 ✭

Join Date: March 2007

Posts: 12

Turns out half the thermostats were connected back to the wrong pipes at the manifold! No wonder the thing was working funny. And worse still the thermostat for the warmest bedroom (1 external wall) was actually controlling the flow for the coldest one (3 external walls).
I don't trust any plumber or electrician at this stage

I've set it on a lot longer to try get the base temperature up but sure that'll probably take a few weeks,

Annoying thing is the thermostats... every time the heating powers off, the thermostats go off, and when it comes back on they revert to their default temp which is 20, so i have to go changing them all the time... (i.e. setting the rooms I dont want to a low temp requirement)

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