domestic coil

domestic coil

PostBy: ryan20strohl On: Wed Sep 05, 2012 6:47 pm

question for all uses out there, do you think that if i rolled 1/2 pex up like a efm 520 coil or any kind, do u think it would work inside the boiler as a domestic coil? i would connect it to the efm 520 mounting plate, and this would take away my hard water problems at least in the domestic coil, meaning never replacing it.
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: domestic coil

PostBy: lsayre On: Wed Sep 05, 2012 7:39 pm

I'm only guessing (having never worked with PEX) but I would think that on more occasions than you would imagine the internal water temperature of the boiler would exceed the rated temperature limit of PEX. Also, PEX is probably not anywhere near as efficient at heat transfer as copper. For a radiant floor where things happen slowly over time and the water circulates through and around again and again this doesn't matter much, but when 50 degree water is traversing one time only through a mere few feet of coil and you want it to be 130 degrees on the other end it matters a lot.

Others with far more knowledge and experience with PEX will assist here.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: domestic coil

PostBy: ryan20strohl On: Wed Sep 05, 2012 8:05 pm

hello larry im going to give it ago and see what happens, the worse it can do is work :) i might throw a cupple more raps in for more coveage i will def. let uses know if it works or fails. im goin to try this tomarrow
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: domestic coil

PostBy: McGiever On: Wed Sep 05, 2012 8:24 pm

Pex tube has both a temp and pressure rating printed on it and that will be your indicator of pending failure. House water pressure is much higher than boiler pressure. 50-60 lbs. @ 210*F+ might be a little too much for the PEX. :idea:
When it ruptures...then your boiler goes up to house pressure. :o

As stated by *lsayer*, PEX is not even close to copper as for heat conduction, besides, the copper coils have additional fining it's entire length to improve is abilities to conduct. Smooth PEX is a far cry, even if adding a couple extra wraps.

Before it ruptures you will have mediocre results at best. :!:
McGiever
 
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hot Air Coal Stoker Stove: HARMAN MAGNUM
Hand Fed Coal Stove: RADIANT HOME AIR BLAST
Baseburners & Antiques: OUR GLENWOOD 111 BASEBURNER "1908"
Coal Size/Type: PEA / ANTHRACITE, NUT-STOVE / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek

Re: domestic coil

PostBy: ryan20strohl On: Wed Sep 05, 2012 8:36 pm

i do agree with uses but i just gotta try it, its just to tempting to see if it actully works.
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: domestic coil

PostBy: ryan20strohl On: Wed Sep 05, 2012 8:38 pm

my coil has a hole in it already so thats y im trying it
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: domestic coil

PostBy: Pacowy On: Wed Sep 05, 2012 8:40 pm

I'm not a plumbing expert, but when the boiler goes up to house pressure, doesn't that mean it's likely to blow the PRV, dumping loads of cold water into the boiler and boiler water into the surrounding area?

Mike
Pacowy
 
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Re: domestic coil

PostBy: Scottscoaled On: Wed Sep 05, 2012 8:43 pm

Sounds like you might have to blow the main ballast tanks to make that sub surface :lol:
Scottscoaled
 
Stoker Coal Boiler: EFM 520x3, 700 Van Wert 800
Hot Air Coal Stoker Furnace: EFM 150, Keystoker 150
Coal Size/Type: Lots of buck

Re: domestic coil

PostBy: Rob R. On: Wed Sep 05, 2012 8:47 pm

Ryan, I don't think you will be impressed with the performance of a Pex coil. A better solution is a new coil, or solder the old one if it is only pinholed in one spot. If your water plugs the coil, you probably need a water softener. I know none of these suggestions are cheap, but the right way rarely is.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: domestic coil

PostBy: ryan20strohl On: Wed Sep 05, 2012 8:59 pm

uses guys are right im going to try to fix it
ryan20strohl
 
Stoker Coal Boiler: efm stoker and allen stoker
Coal Size/Type: rice and buck
Other Heating: allen stoker
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

Re: domestic coil

PostBy: Scottscoaled On: Wed Sep 05, 2012 9:56 pm

I see guys take copper fittings and make new coils. Don't know how well that would work. You almost could use that bendable copper, K I think, and form a coil like that. That would work better than Pex. If you end up fixing the coil, do post pictures. We don't have any of this.
Scottscoaled
 
Stoker Coal Boiler: EFM 520x3, 700 Van Wert 800
Hot Air Coal Stoker Furnace: EFM 150, Keystoker 150
Coal Size/Type: Lots of buck

Re: domestic coil

PostBy: stoker-man On: Thu Sep 06, 2012 5:23 am

If you don't have the surface area of the copper for proper heat transfer, you can forget about 5 gpm of hot water. The copper tubing is crimped to form the ribbed area and I don't know the true compression, but if you have 10 feet of crimped copper, it probably started out as a 20 tube. Just guessing.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove