piperun above feed/expansion tank

[Walled]

Dear all

Due to a slight oversite in the plumbing of our new build house, we realise that the flow and return pipes to one of our two underfloor heating manifolds runs above the f/e tank!

The house is single storey with no loft so we cannot raise the f/e tank any higher. The pipes above approximately 150mm above the top of the f/e tank. The manifold that the pipes are running to are well below the f/e tank level. We are using a vented thermal store with direct connections for the underfloor heating circuit.

My question is, will we be ok with this or will it result in the water from the the high level pipes pouring out of the f/e tank? (Assuming we get the water to pump ok).

Our only alternative is to lay more pipes out, under the drive and back in through the wall to the manifold. Great.

As you probably realise, I'm not a professional plumber!

Any opinions would be very welcome.

Thanks

Ian

 

[danielp]

well they wont fill up have you run this system like this?

 

[REDSAW]

Dear all

manifolds runs above the f/e tank!

The house is single storey with no loft so we cannot raise the f/e tank any higher. The pipes above approximately 150mm above the top of the f/e tank.

As you probably realise, I'm not a professional plumber!

Any opinions would be very welcome.

Thanks

Ian

i dont understand?.

are you saying your underfloor heating is on the ceiling/?.
if not why cant you raise the f/e to it?.

 

[Renewable M]

And running underfloor (with all the hydraulic resistance in the floor pipes) on an open vented system will highly likely just result in overpumping rather than the system water going through the pipes in the floor.

The water will take the route of least resistance you see, and if its easier for it to pump out of the expansion into the feed/exp tank, it will do so.

You may be lucky but......

 

[stevetheplumber]

And running underfloor (with all the hydraulic resistance in the floor pipes) on an open vented system will highly likely just result in overpumping rather than the system water going through the pipes in the floor.

The water will take the route of least resistance you see, and if its easier for it to pump out of the expansion into the feed/exp tank, it will do so.

You may be lucky but......

system pump will not see the resistance of the underfloor as the pumps on the manifolds overcome this system pump just circulates the loop to the manifolds
but water will not circulate above the feed tank

 

[Walled]

Redsaw

No, the ufh and manifold is on the ground. It's only the feed/return pipes that go up into the ceiling and back down to the manifold.


Steve the Plumber

Will the ufh pump not push the water up above the f/e tank? The length of the feed/return pipes that are above the tank is about 10m, though they are only 150mm above. Does that make any difference?

I was thinking that even thought the thermal store is vented, and the ufh connection is direct to it, the ufh circuit itself is to all intents and purposes a sealed system. Will the pump not maintain the integrity of the circuit by stopping the flow of water into the store and out of the f/e tank?

Cheers

Ian

 

[stevetheplumber]

Redsaw

No, the ufh and manifold is on the ground. It's only the feed/return pipes that go up into the ceiling and back down to the manifold.


Steve the Plumber

Will the ufh pump not push the water up above the f/e tank? The length of the feed/return pipes that are above the tank is about 10m, though they are only 150mm above. Does that make any difference?

I was thinking that even thought the thermal store is vented, and the ufh connection is direct to it, the ufh circuit itself is to all intents and purposes a sealed system. Will the pump not maintain the integrity of the circuit by stopping the flow of water into the store and out of the f/e tank?

Cheers

Ian

no will not feed higher than the tankyou need to take them across lower

 

[oap67]

Why not do away with the expansion tank etc and pressurise the system to 1.5 bar complete with 3bar blow off valves and a good quality auto air valve.

Richard

 

[wnjswozo]

as oap67 says convert to sealed system

 

[stevetheplumber]

Why not do away with the expansion tank etc and pressurise the system to 1.5 bar complete with 3bar blow off valves and a good quality auto air valve.

Richard

you cant seal a thermal store tank isnt made to take any preasure

 

[wnjswozo]

are you sure thought they withstood 10bar

 

[Robtheplumb]

you cant seal a thermal store tank isnt made to take any preasure

Some are Steve, the ones from NUheat for example, and these are for underfloor heating as well.