how to plumb two boilers in series

how to plumb two boilers in series

PostBy: fstalfire On: Mon Apr 28, 2014 10:07 pm

I have an oil fired boiler currently and have just purchased a coal boiler, I would love to be able to keep the oil unit hooked up and put the coal one next to it and connect it to the oil unit to utilize the auto fill and circulators currently in use as well as the thermostat hooked to the oil unit.......Is this possible? if i tapped into the water lines from the oil unit wouldnt the coal unit keep the water in the oil unit boiler at temperature, essentially doing the work of the oil burner without it being on and taking advantage of the thermostat and cirrulators plus having a back up if i run out of coal or travel for more than a few days?
fstalfire
 

Re: how to plumb two boilers in series

PostBy: whistlenut On: Mon Apr 28, 2014 10:21 pm

Do a search, all the info is already here. The answers to your questions are: Yes, YES, and Yes!

Welcome aboard! The search box is in the upper right corner...............
whistlenut
 
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ&VanWert
Hand Fed Coal Boiler: Franks Boiler,Itasca415,NYer130,Van Wert
Hot Air Coal Stoker Furnace: Yellow Flame
Hot Air Coal Stoker Stove: Alaska-4,Keystoker-2,
Hand Fed Coal Stove: Alaska,Gibraltor,Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Van Wert, NYer's, Ford,Jensen.
Coal Size/Type: Rice,Buck,Pea,Nut&Stove
Other Heating: Oil HWBB

Re: how to plumb two boilers in series

PostBy: coaledsweat On: Tue Apr 29, 2014 6:44 am

Yes. You will need an additional expansion tank or one larger. Keep in mind you'll have some parisitic loss from the oil burner's chimney. Not a real big deal with the savings. A automatic stack damper can reduce that to next to nothing.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea


Re: how to plumb two boilers in series

PostBy: Rob R. On: Tue Apr 29, 2014 12:34 pm

fstalfire wrote:I would love to be able to keep the oil unit hooked up and put the coal one next to it and connect it to the oil unit to utilize the auto fill and circulators currently in use as well as the thermostat hooked to the oil unit.......Is this possible?


It sure is, I have done it a few times. I prefer to use two closely spaced tee's in the supply rise on the oil boiler, but that isn't possible on every installation. If you post some pictures of your existing piping we can probably come up with some ideas.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: how to plumb two boilers in series

PostBy: Sting On: Tue Apr 29, 2014 1:02 pm

A "Series' instillation is the quickest cleanest simplest way to "get-er-done" and there is nothing wrong with that

Please note = I didn't use the word 'BEST'

Close spaced Tee's ??? WOW here we go with Primary/Secondary school again :shock:

I used to recommend that to folks that didn't want the drama - didn't want the expense - didn't want the extra pumps and all that jazz -- and most often that didn't end well

It Depends :P
Sting
 
Other Heating: BurnHAM=NG-gas

Re: how to plumb two boilers in series

PostBy: fstalfire On: Tue Apr 29, 2014 8:10 pm

So...I have moderate Plumbing skills....is a series connection something I could handle or should i call a plumber? and, what is the installation?
fstalfire
 


Re: how to plumb two boilers in series

PostBy: Sting On: Tue Apr 29, 2014 8:53 pm

read some of the above post links
I forgot most of them
maybe read a little of this

http://nepacrossroads.com/post428552.html#p428552

if you understand the stuff = then yes U can
Sting
 
Other Heating: BurnHAM=NG-gas