Propane(95,000 BTU/gal)@$1.55 per gal= $16.25 per million BTU
Oil (140,000 BTU/gal)@$2.00 per gal= $14.30 per million BTU
Elect (3410 BTU/ KwHr)@ $.10 per KwHr= $29.00 per million BTU
Nat Gas is a little more complicated to compute but
most gas companies NOW sell it on a $ per million BTU basis or they can give you this value, my guess is the price now is about $9.00 per million BTU. Since natural gas is more local ly produced energy it would normally be the lower priced source. Most propane comes from processing natural gas so the processing costs will make it more costly , and we know where most oil comes from and it will be more volatile pricing.You can fine tune this table by asking your local supplier for their precise numbers, but mine won't be far off and most suppliers will just roll their eyes back into their heads if you ask such questions. Anyhow you can see it is easy to compare energy types, the trick is to determine how efficient the appliances are and here you look at the nameplates on the appliance and (hope) its there. For instance if you had two oil heaters each with the same input rating of 100,000 BTU/hr and one had an efficency of 100% and the other had 50% you can see you'd use twice as much fuel in the lower efficient appliance.
I attended the Buderus GB142 seminar last spring, a very similar unit to the Viesmann and nobody said anything about 7 years between service.
Jim bolduc is the sales rep for ME NH MASS and I will ask him monday about this. Vitodens 100, 200 with the matrix burner i know all about them they have to be serviced every year. Anything that burns anything that has moving parts has to be cleaned once a year MIN!!!
Quote...Side note the New wall hungs have zero thats right 0 carbon monoxide exhausting from them.......Unquote Jim bolduc