Outdoor Wood Boiler CL 5036 Pump Size & Plumbing Questions

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fuzzybird

New Member
Jul 19, 2022
2
Northern MN
Hello, I am very new to wood Boilers and have been reading everything I can the last couple months and it has led to more questions. My plan is to run Thermopex buried 50 feet to the crawlspace and continue another 30 feet through the crawlspace to the basement. Then I would do regular 1" Pex from there about 20 feet to a 20x20 heat exchanger in the force air furnace. Looking like just over 200 feet round trip. This would be the minimum I would need to get the boiler heating our 1500 sq foot single story home through the forced air furnace. We also have an unheated attached garage I was considering adding a fan powered heat exchanger to add some heat to keep it above freezing and maybe in the 50 degree range that would add another 40-50 feet of pex round trip. Im thinking I will also have a filter in the line and 4-6 ball valves and a couple temp guage valves to monitor the incoming and outgoing water temps. Everything would be below the Boiler in the basement beside possibly running to the garage which I would mount the heater maybe 6 feet off the ground but still below the top of the boilers height.

Would this need a stronger pump or would something in the Taco 009 or 0011 range work for circulating the water through the pex and heat exchangers? I know too small of a pump can cause issue but would too big of a pump also cause issues? Would adding the garage heater make a big difference to this system for pump size? Would adding the garage on the loop need a manifold or just split off the pex tubing with a t valve going to the furnace or after? Last year we had a decently cold winter and used 200 Gallons of Heating Oil in December, again in January, and February and another 200 the rest of the year. Hoping to replace the roughly 800 gallons used a year or most of that with the prices now being over 5 bucks a gallon. Im sorry for all the questions as I am still very early in learning about these systems and would like to do it right the first time. Im hoping to keep it a simple setup but I am open to any advise or suggestions you may have.
 

sloeffle

Minister of Fire
Mar 1, 2012
1,072
Central Ohio
I posted about this about month or so ago. You should be able to use my numbers as a guide. I'm going to long sweep 90''s, that should remove about 80 feet of head from what I'm being told.


Run your numbers and post them here and we should be able to figure out a appropriate pump size. FYI - I'm going with a 26-99, the 15-55 is a little too small IMHO.
 

fuzzybird

New Member
Jul 19, 2022
2
Northern MN
I posted about this about month or so ago. You should be able to use my numbers as a guide. I'm going to long sweep 90''s, that should remove about 80 feet of head from what I'm being told.


Run your numbers and post them here and we should be able to figure out a appropriate pump size. FYI - I'm going with a 26-99, the 15-55 is a little too small IMHO.
Thanks for the response! I did end up ordering a Taco 0011. It uses a bit more electricity but only a few bucks a month. Im thinking it should be plenty for my setup and allow me to add a garage unit as well with no issues. My system will be a pretty straight shot with no bends and just the 20x20 heat exchanger in the forced air furnace and the possibly a run to the garage fan exchanger. I plan to start with just the forced air and see where that puts me with return temps to the boiler and then decide on adding the garage!