water heater for heating

Dave Palmer_3

going to do 8 prefab condo units for a customer,2 row houses 4 units each,with BB already installed and stubbed into basement.Low heat loss about 18,000 per unit. Is it worth the work to run them off oil fired WH's,with plate heat exchangers via bronze pump on domestic side rather than boilers with tankless'(labor,parts,etc)? Direct vent,no gas,of course price is a issue.Units to be sold when built.Yes it would be nice to have 1 boiler with HWM but not the case.Hope to have a Propress by than,thanks Dave

hr

Aside from code issues

what temperature do you need for the baseboards? Seems most WH's these days limit at 130-140.

The State Apollo goes to 160°, but I don't believe it is available in oil fired.

Plus you will take a temperature loss through the HX. A close approch sized FP will run more money.

Better do some calcs to make sure it will all work.

hot rod

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Dave Palmer_3

going

over the blue prints Wedsnday,just wanted to have my ducks in a row.....

hr

There are some small

combo boiler/ dhw units out there. I'm not well versed in oil fired, however.

Burnham has the Minuteman, I believe. Laars used to have a Minifin combo. There may be others. FP HX's bring some baggage along with them, especially if the water is hard, hard plus the labor and parts to assemble all that.

That being said the Danfoss HX panels are sweet for hang and pipe applications from water heaters. I have used them for small radiant from a wh. I still feel the temperatures required for the bb may be your BB (biggest bugaboo:)

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kevin coppinger_4

the thing w/ oil combo....

is that you now have a very large boiler, say 85K.your demand is 18K.... Thermodymanics has a CWL-DV boiler. direct vent, 5gpm, tankless,small footprint,steel,wet leg. You can get any of the dv burners from becket,carlin or riello. I used one and it did well under a set of stairs. Check out www.thermodynamicsboiler.com kpc

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S Davis

CombiCore

You might wan't to look at a Bradford White CombiCor, they have a oil fired unit with a coil in the tank for heating.
M1-C-50L60F is the 50 gallon model.

S Davis

Robert O'Connor_3

8 boilers/HWH 's?

And will each have their own fuel tank? I hope there's a big basement.

Did you look at quietside?
http://www.unitedenergy.ca/brochures/quietside_brochure.pdf

Triangle tube makes the elite combo. What worries me is it can't be cheap.

You could do a poor man's version of the System2000: steel boiler like a Burnham LEDV (64K output) or NewYorker microtek3-DV (same boiler) on a stand over a low boy 30 gal indirect tank or just a Heat Exchanger plate with a cheaper electric HW tank. I don't think you'll find a smaller oil boiler.

Dave Palmer_3

Kevin,looked

at them and got a real good quote but I'm still looking,thanks

Ken_15

Seems to me that you would be well served with any number of small boilers. Pensotti, Biasi, etc all have 3-pass boilers in the 70-85k range. One boiler for each building. 18,000 per unit x four units per building = 72k btu.

Unless of course each unit needs its own heat source.

Dave Palmer_3

wish I could

but has to be all separate units

Robert O'Connor_3

Dave

Let's us know if you got the job. I'm curious to see how you wind up doing this. Combo's look like the perfect solution but I've never worked with them and heard some horror stories on the Polaris WH's. Wonder what's a cost effective solution. BTW Is there a common oil tank for the condo and will each unit get metered, split the cost, or get their own oil tank.

Dave Palmer_3

separate

tanks for each.I've got the job no matter what, its just deciding what to use.Don't worry there we be plenty of photos.Dave