Underfloor Heating

[yugons]

Hello Guys

I am a newbie and would appreciate any views or guidance you have on the Polypipe floating floor system as it is set in pre-formed panels with the tubing 300mm a part with alloy reflector plates the Amtec underfloor boiler is maintaining 60c in the manifold but is not providing the estimated room temp.of 18c to 22c as calculated by Polypipe who checked installation when fitted.

The system is struggling to achieve 16c this is in a newly built extension with all required insulation to building regs.

The plumbers i have spoken too are of the opinion that this sort of distance between the tubing is unlikely to attain these temperatures

Polypipe have now released a new system which has the tubing at 150mm apart which i can belive would most likely achieve those temperatures.

Thanks in anticipation Nigel.

[build4]

Hi,
What is the floor covering over the underfloor heating?
What is the return temperature?
How many zones do you have?

Rajmund Lakatos
Build4
http://www.build4.co.uk

[yugons]

Hello Rajmund

Thanks for the reply

The floor covering is vinyl-lay in the kitchen, bathroom & utility with carpet with felt backing designed for underfloor in the other rooms.

The return temperature is between 20-30c

There are 6 zones

Regards Nigel

[build4]

Hi Nigel,
The temperature drop is sound to much to me (30-40 degrees).
Two things:
-if the flow rate set in right maybe your circulating pump is not big enough (or set too low)
-if the pump is the right one maybe the flow rate is wrong on the manifold
You can try to speed up the pump if there is any option on the side or turn up the flow rate on the manifold (but this should be supplied by the UFH supplier)
When you have a sysem set it right, you should have aboult 10 degrees temp. drop.

Regards

Rajmund

Build4
http://www.build4.co.uk

[yugons]

Hello Rajmund

I have increased the pump speed and as you say this has brought down the return temp to a 15c difference but has made very little difference to the room temp.

I am still unsure about the 300mm spacing of the pipe work to be able to provide the heat required but as the formed polystyrene slots do not allow the pipe work to be closer unlike the screeded floor matting.

Where should i look now any help would be appreciated.

[build4]

Hi Nigel,
I hope you have some solution since you wrote, you can be right with the spacing you can check the floor surface temperature is same everywhere or where the pipes are there is warmer. The heat spreading plates are 300mm wides (so is fully covering the floor and spreading the heat)?
Did you had any heat loss calc. on your house(so the sizing is right)? This was like a DIY pack or Polypipe calculated?
Rajmund

Build4

[yugons]

Hello Rajmund

Polypipe did the calcs so will keep trying to solve the problem as poly pipe are little help in offering a solution.