Buderus g142

GW

kind of a clash in technology- the warm air needs hotter water than the rads, generally speaking. you'll be operating above the condensing temps most of the time, unless you don't mind 'cool' air blowing around.

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Rodney Summers_2

Twining Buderus g142

I have a project with rads, hydro air and dom hot water.
total BTU's 200k. would it be cheaper to operate two g142's vs one or even two WM ultras?

With regards to Jen's replie I two have installed WeilMclaine Ultras and and have been verry pleased with the product.

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Rodney Summers

Thank you Gary; and I agree with you as far as cool air and not allowing the boiler to condense. The area inquistion has a lot of floor to celling windows and recp in the base board. To do this right I will have to be creative and look for placements of panel rads.

How abbout twining would it be a benfit a 200k total load or not.

MikeL_2

Beg to differ. I heat a 4500 sq ft house with a big 4 coil Lifebreath AH fed by a Buderus GA124/17 via a buffer tank. The air handler runs on low (340 CFM), so there is no blowing at all. The target temp of the boiler is 134F at -6F design temp. The boiler return temp from the AH is 80F or thereabouts. Most of the winter the boiler supply is around 104F. All the return temps are well within the condensing range of mod-cons and I'd argue the supply temps are lower than a baseboard system.
Then again, I have an ICF house that needs only 19000 BTU on design day.

GW

OK then

you got me there; i was speaking in general terms

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GW

twins

I'm not sure there is a great benefit with having twins. Sure, there is a safety factor if one drops, but at the end of the day you're dropping more money than you need to. If you're system is able to utilize the low temp technology, then yes, do it up.

I did not catch the full story, is this multiple zones? if yes, perhaps the twin job makes a bit more sense.

If you twin them, how will you call on the second unit? It's all in the controls. Control freaks make the best hydronic systems.

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Mad Dog_2

Ray Landry has done several jobs with ganged-up GB 142s

but if I recall it was on much larger loads like snowmelt. That is the beauty of the Mod/cons: The GB-142-60 will get you in to the range your looking for and will turn all the way down to the 60 K Btu range. With the AM-10 ODR control you'll have a very well-designed system. Is the heatloss really that high? How large of a building? From the sound of your needed goals, I'm not sure the twin boiler set would be necessary or practical. We've used single GBs to handle jobs with Hydro coils, radiant, domestic water and hi temp baseboards. Mad Dog

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