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Central Heating

Underfloor heating manifold

Anonymous user 15/03/2024 - 2.39 PM

Dear Sir/Madam I had underfloor heating installed on the ground floor approx area size 60m2 and screed on top with suitable underlay & laminate flooring as the finish the whole area was covered with the coil pipe now some areas of the floor get warm when turned on....... I have a 2 port manifold due to the length of the coil pipe while turned on.... only 2 pipes on the manifold get hot the other 2 return pipes feel very light warm first question .... should all 4 pipes on the manifold flow and return feel hot second question ... why am i getting some areas of the floor warm and not all as the layout covered mostly the whole room Kind Regards

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2 Answers

Artisan Plumbing & Heating

Rating: 5 out of 5

Hove

It may be that the flow through the balancing valves has been throttled down, so get someone who understands ufh to have a look, and to check the pump also. I must say, 60sqm sounds like a very large area to heat with only two circuits. It may well be the case that the pipe loops for the circuits are too long such that they have lost all their heat by the time they get back to the return manifold. This will lead to cold areas of floor and inadequate heating but there's not too much you can do about it. First step - open up the valves and ensure the pump is good.

Answered13 May 2018

Anonymous user

A couple of things here: 1. If the diameter of the pipe is 20mm then the pipes can be installed at 300mm centres then 2 loops is sufficient. If pipes are of a smaller diameter or spaced further apart then 2 loops is not sufficient (but too late now) 2. Flow rates will almost certainly be an issue and can be adjusted (carefully). 3. Possibility that loops haven't been filled correctly resulting in air trapped in parts of the loops. 4. How is the underfloor heating controlled (timer, thermostat) and is it controlled separately to the rest of the heating system? 5. All of the above can be confirmed by thermal imaging.

Answered27 June 2018