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03-01-2008, 06:45 PM #1New Guest
- Join Date
- Feb 2008
High effeciency boiler w/o radiant?
Thanks for everyone's responses to my last post.
I am getting an estimate on replacing my New Yorker boiler. I'm interested in using a system other than oil. My New Yorker that is power vented (no chimney) is noisy and smells of exhaust. It may be because the power vent comes on right when the furnace fires up and not before as I think it is supposed to.
Anyway, the estimate will be for a Buderus high efficiency condensing boiler. My question is will this be cost effective in the long run if I only have forced hot water baseboard (finned copper)? I've heard that the higher temps reduces condensing, therefore lowers efficiency? How much would this lower my efficiency and would it still be a good decision?
03-01-2008, 07:19 PM #2
Since you've got copper finned baseboard convection heaters, you certainly won't realize the savings of a low temperature application. Few houses in the USA can realize those savings. However, operating with an outdoor temperature reset control can lower the water temperature as low as about 145F. That is some savings. But I'd suggest you consider a low mass boiler like the System 2000. With the low mass, you won't need to heat up the big, heavy cast iron boiler block and won't lose the heat as much during stand-by. In fact, if you need a power vent, it is possible to run the System 2000 as a direct vent unit, though we prefer to install the System 2000 power vent as you get better combustion performance. Their power vents are sized for the boiler and are relatively quiet compared to the universal field installed units. The System 2000 goes from room temperature, cold start up toe 145F in only 90-seconds. To prevent condensation in the boiler, there is a zone valve that remains closed until the water temp is up to 145, then it opens allowing water circulation. Some untrained personnel don't like the System 2000 because you have to know how to work with the Energy Manager. But it's no big deal for a competent service tech. I've got one in my own home and it's saved me a whole bunch of money over the last couple of years. My service manager also has one and loves it. They're so quiet operating you can barely hear them if you get the model with the air box on it. Personally, I think they're just the ticket for copper finned baseboard applications. For radiant applications I'd go with either the Buderus of Viessmann condensing boilers. There you can take advantage of the boiler and water mass that's advantageous to the radiant temperatures. Each product has its place in the industry, IMO.If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!
03-01-2008, 07:38 PM #3Professional Member
- Join Date
- Feb 2007
The power venter should definitely come on before the boiler fires. Your whole problem is the power venter. Get some kind of conventional flue.
You sound like you're hell bent on getting a new boiler, and that's your decision, but remember the boiler is one piece of equipment, and the power venter is another.
03-02-2008, 06:27 AM #4
Your power venter is not hooked up right.
As far as a high efficiency mod/con gas boiler.
You will see a savings. How much, can't be pridicted over the internet.
A mod/con, even if it the water temp is above condensing temp, will reduce its firing rate to what the house needs. The Buderus comes with OD reset.
Before you switch to gas. Check you rates.Contractor locator map
How many times must one fix something before it is fixed?