Im heating my building with a propane fired commercial hot water tank and Im in the middle of plumbing. My pump is on the return side and I was planning on putting the tank where the piping leaves off in the pic..But Im reading its supposed to go on the suction side of the pump.. Anyone have any suggestions on what I should do? Should I remove the vertical run where the pump is and turn it horizontal and put the tank behind the pump? See pic. Thanks!
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Radiant System Plumbing help
- Thread starter tmcelheny
- Start date
I do all my radiant set-up flooring the book ... "pumping away".
Did you do a heat load? -- what's the BTU of the WH?
I had a heat loss done. They calculated 42k BTU unit was required. The unit is a 50k BTU. I have spoken with an engineer this morning and realize I will need to relocate the pump to be ahead of the expansion tank so its on the suction side. So the plan will be to put the pump up near where the tank was going to be and the tank behind.
Have been advised the pump could be on supply or return, just so the pump didn't have to overcome the pressure from the expansion tank prior to system.
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I normally exit the boiler and go to a spirovent -- use the tap under for the expansion tank and have the boiler make up water come in between the two with a tee.
The pump is next -- so it pumps away from spirovent and into manifold.
With a true boiler you need a primary secondary -- or constant circulation to the highest temp manifold loop.
Return manifold back to boiler.
Feed to the boiler is back flow preventer and feed valve
The pump is next -- so it pumps away from spirovent and into manifold.
With a true boiler you need a primary secondary -- or constant circulation to the highest temp manifold loop.
Return manifold back to boiler.
Feed to the boiler is back flow preventer and feed valve
86turbodsl
Well-known member
yeldogt is right, you want the inlet of the pump to be upstream of the spirovent so the reduced pressure on the inlet drops the pressure and bubbles can be vented in the vent. Also the increased pressure AFTER the pump can enhance heat transfer into your load.
(edit) that sounds wonky, but the point is there... lol...
(edit) that sounds wonky, but the point is there... lol...