[yellowkid]

Hi -- new here and first post! I'm planning an addition and need to extend my current hot water heat in. the furnace/boiler is adequate in size so that is not an issue. I plan on using radiators vs. baseboard like the rest of the house. I'm planning a crawlspace foundation, which will be about 2' lower than the main structure. I'm worried that the new pipes will be lower than the rest of the system and create issues when the system needs to be drained, and also in circulating the water to the new radiators? thx

 

[Bondo]

Hi -- new here and first post! I'm planning an addition and need to extend my current hot water heat in. the furnace/boiler is adequate in size so that is not an issue. I plan on using radiators vs. baseboard like the rest of the house. I'm planning a crawlspace foundation, which will be about 2' lower than the main structure. I'm worried that the new pipes will be lower than the rest of the system and create issues when the system needs to be drained, and also in circulating the water to the new radiators? thx

Ayuh,... As far as circulatin,' the elevation difference won't matter in the least, once the system is refilled, bled, pressurized, 'n runnin'....

If you think you'll ever need to drain the loop, ya,.. ya need a drain at the lowest point...

 

[jagans]

Cant you just put a T on the end of the loop, and run the pipe out to a curb cock outside the foundation? That will be your system drain. The pump will handle a 2 ft. head on the return with no problem. Bleed at the radiators, no?

 

[mrairflow]

depending on the size of the addition might want to use zone control and make it a seperate zone

 

[NiNe O]

If it's for freeze protection, just run glycol through it, just make sure you can isolate each loop separately.

 

[yellowkid]

excellent thx gentlemen! was thinking too that i should just add a drain at the lowest point in the addition. I think the original setup was gravity but now I've got a circulation pump

 

[Canucker]

Is it a pump added to an old gravity system or has all the piping been changed to a forced water supply? It will make a difference on how you supply the addition depending on what you already have.

 

[ben's plumbing]

if your going to use radiatiors over baseboard ..may consider installing a zone valve for the addition... and t stat..ben sr.......sorry same thought ..as another should have read all post...

 

[yellowkid]

the boiler/pump etc is all new, the two main lines are original to the system but all the lines to the radiators throughout the house are new 3/4 copper. my guess is I need to run larger lines out to the addition with branches to the new radiators? looking at 3-4 new radiators in the addition. again thx for the help -- this is really helpful!

 

[Bondo]

the boiler/pump etc is all new, the two main lines are original to the system but all the lines to the radiators throughout the house are new 3/4 copper. my guess is I need to run larger lines out to the addition with branches to the new radiators? looking at 3-4 new radiators in the addition. again thx for the help -- this is really helpful!

Ayuh,... If it's gonna be a separate zone, with it's own control, T at the pump, 'n add another pump, 'n run 3/4" or 1" pex through to the addition, 'n feed yer radiators...

What kinda boiler,..?? Gas,..?? What controls,..??