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Hidden pipe installations through the house
Hello,
I plan to run 2 PEX pipes from the district heating exchanger through the entire house in the basement and out through the wall (for floor heating in the garage that will be built). I will run these pipes without joints and then build a slot in the ceiling for them. It's about 12 meters internally.
I will also run 2 pipes from the exchanger for cold and hot water to the mixer and outlet over the same distance.
Question 1: The garage will have 55m2 of floor heating. How thick should the pipes be from the exchanger to the distributor in the garage?
Question 2: How many loops in the garage and dimension? 16mm in the garage slab? (300 mm insulation)
Question 3: Must these be insulated when running through the house? Is regular pipe insulation enough?
Question 4: The cold and hot water piping, dimension for these and is pipe-in-pipe enough or should they be insulated?
Question 5: Any other tips to consider?
I was thinking of using PEX tubing for everything. Does PEX withstand floor heating temperature? I was thinking of having the mixing group in the garage.
Best regards!
I plan to run 2 PEX pipes from the district heating exchanger through the entire house in the basement and out through the wall (for floor heating in the garage that will be built). I will run these pipes without joints and then build a slot in the ceiling for them. It's about 12 meters internally.
I will also run 2 pipes from the exchanger for cold and hot water to the mixer and outlet over the same distance.
Question 1: The garage will have 55m2 of floor heating. How thick should the pipes be from the exchanger to the distributor in the garage?
Question 2: How many loops in the garage and dimension? 16mm in the garage slab? (300 mm insulation)
Question 3: Must these be insulated when running through the house? Is regular pipe insulation enough?
Question 4: The cold and hot water piping, dimension for these and is pipe-in-pipe enough or should they be insulated?
Question 5: Any other tips to consider?
I was thinking of using PEX tubing for everything. Does PEX withstand floor heating temperature? I was thinking of having the mixing group in the garage.
Best regards!
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I can tell you how I've done it, it maybe isn't entirely by the book but it works excellently.
I have a 95m2 (internal measurement) attached garage. 200mm insulation under the slab. Three loops (20x2 pex) each 40m in length, this results in a too sparse layout if you're aiming for comfort but works well if you only want the underfloor heating for warming. I feed the garage's underfloor heating manifold from the district heating exchanger with 15x2.5 pex pipes, both supply and return are about 10m long. I haven't insulated these pipes. The supply temperature from the district heating exchanger varies in winter between 35 and 55º, I have it constantly regulated at about 27º for the water going out from the underfloor heating manifold, and that's enough to maintain 17º in the garage even in winter (in Västernorrland). If it exceeds 17º in the garage, a room thermostat shuts off the supply to the underfloor heating manifold's circulation pump.
I have a 95m2 (internal measurement) attached garage. 200mm insulation under the slab. Three loops (20x2 pex) each 40m in length, this results in a too sparse layout if you're aiming for comfort but works well if you only want the underfloor heating for warming. I feed the garage's underfloor heating manifold from the district heating exchanger with 15x2.5 pex pipes, both supply and return are about 10m long. I haven't insulated these pipes. The supply temperature from the district heating exchanger varies in winter between 35 and 55º, I have it constantly regulated at about 27º for the water going out from the underfloor heating manifold, and that's enough to maintain 17º in the garage even in winter (in Västernorrland). If it exceeds 17º in the garage, a room thermostat shuts off the supply to the underfloor heating manifold's circulation pump.
Thank you for the response!
"I supply the garage's underfloor heating pump from the district heating exchanger with pex pipe in pipe 15x2.5, both the supply and return are about 10m long." Do you mean that you have the pump group by the exchanger 10 meters from the garage? Does this work well? It sounds like the supply hose is very thin?
"I supply the garage's underfloor heating pump from the district heating exchanger with pex pipe in pipe 15x2.5, both the supply and return are about 10m long." Do you mean that you have the pump group by the exchanger 10 meters from the garage? Does this work well? It sounds like the supply hose is very thin?
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No, the feeder hose (and thus also the return) is 10m long. The shunt is in the garage.
I am aware that a larger feed is recommended for a shunt that is supposed to serve 95m2. But it evidently works very well in my case with 15mm pex. The garage is, by the way, fairly well insulated, 200mm in the walls and floor, 400mm in the ceiling, and modern windows.
I am aware that a larger feed is recommended for a shunt that is supposed to serve 95m2. But it evidently works very well in my case with 15mm pex. The garage is, by the way, fairly well insulated, 200mm in the walls and floor, 400mm in the ceiling, and modern windows.
I used Uponor (wirsbo) combipex which can handle a maximum of 70º continuously, and my district heating center never sends out water that hot, but of course, it depends on what setting you have.
Yep, 15x2.5, 10mm internally.
Yep, 15x2.5, 10mm internally.
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