Oil boiler question

Old 11-02-2011, 06:57 AM
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Default Oil boiler question

i am in the process of adding approximately 1500 sq ft living space over and behind a 3 stall roughly 35 by 25 garage. existing home is a little over 3400 sq feet and is heated by FHA, two furnaces servicing 2 zones (upstairs and downstairs). Upstairs furnace also has an AC unit that serves the whole 3400 sq ft. It keeps the house comfortable but upstairs gets warm on the hottest days and it runs continuously. House is very open on the first floor and, with a second floor loft, air exchanges easily between the two floors.

the addition will be insulated with foam, min R-30 walls (including garage walls and ceiling) and min R42 roof. the addition is trussed roof and no attic. The existing house, being a contemporary, has approximately 1/2 the roof typical construction (collar ties/rafters) and the other 1/2 has the ceiling the same as the roof line with no attic. the attic on 1/2 will also be conditioned space after spray foaming to min R42 the rafters and soffit area.

I am replacing the floors in the main home as past of the project. Planning on moving to radiant floor heat for the main house and the addition, but keeping FHA for the second floor served by a hydro unit in the attic. also planning on AC'ing the house through attic units as well.

Having a hard time getting good advice from contractors so I am trying to research this to make a decision. I am leaning towards the following:

Viessmann Vitola 200 for my heating needs
For hot water, currently have propane. not sure if I should go with a separate on demand propane WH or use the boiler to service everything.

another option would be 2 separate boilers, with one for water as well (maybe a weil mcclane 3 bypass).

some concerns I have:

Is it bad for a boiler to sit unused for the summer if it is not being used for hot water?

With any of these systems, is indirect hot water a better choice?

will I have issues with my current chimney due to potentially lower stack temps? it is center house design so maybe ok?

NG is not an option and propane has been averaging a little more per gallon than my oil and has much lower BTU output/gallon.

What type of $$'s does a Viessmann go for versus something like a weil mcclane?

I am not interested in the high efficiency/condensing options-too costly and complicated.

Any advice would be appreciated. Some of my ideas came out of THT searches.
Old 11-02-2011, 09:06 AM
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I'll tell you what I installed in my house in CT about 10yrs ago.

Burhnam boiler, not the model that had problems. It was not the super complicated one either. I changed the original firing rate from 1.0 gph to .75 (took a minor modification to the Beckett burner). I also changed the aquastat from "cold start" to one that maintained temperature (set at 100 degrees).

I had radiant heat in one area, hydroair in another, several zones of cast iron baseboard, 2 toespace heaters, 2 unit heaters and 1 heated towel rack. 2 indirect water heaters, (1) 75 gallon, this did 3 bath rooms (including a 100 gallon jetted tub), laundry, the kitchen and (1) 30 gallon for a detached addition.

As far as to what product to use, I'd ask the guy who's going to be servicing it. Find out if there's a wholesale supply nearby for the products. Are repair parts redly available?

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