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[cdie]

I have a lennox oil fired boiler with what the brochure calls a tankless domestic coil. placing my wb in place now in series and i'm concerned I wont be able to heat the domestic water satisfactorily if i'm not heating the dwc as intensely as the oil fire would. how much water is in the lennox cowb3? cant find that online. will I need to sidearm a separate hot water tank to have wood fired domestic in my application? my boiler is an older glenwood with 11 gal tank on top of the unit and +/- 50' of coil in the firebox. thank you

[LittleJohn]

Page 14 of Installation Instructions: (Tankless rating)
Appears to be able to heat water from 40 to 140f @ about 3 gpm -> or roughly about 150k BTU/hr  **With intermittent draw and 200f boiler set point**

Page 15 of Installation Instructions: (amount of water in oil burner)
3 sections - 9.6 gallons
4 sections - 11.6 gallons
5 sections - 13.7 gallons

In regards to sidearm, not needed as Lennox COWB3 (with tankless hot water option, is your heat exchanger).  The older Glenwood you reference, will probably need a sidearm, as you do not want to share with between it and your Domestic drinking water.  I am not 100% certian about your wood stove, might need other options.

[cdie]

thank you for responding but what i'm hoping is that I can still heat domestic with the glenwood using the existing exchanger in the oil boiler. if the existing x is tankless as the specs say, is it still immersed in the 9-13 gallons you reference above? I will be heating the water jacket in the oil boiler with the glenwood for heat just didn't know if I was able to expect to get dhw to be heated this way or does the coil receive an intense, direct fire from the oil burner I cant give it with the glenwood from 60 feet away?

[slimjim]

You will be fine as long as you heat the oil boiler to at least 180 degrees and the tankless coil is clean!