How to choose the proper size for your boiler
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- Опубликовано: 17 июн 2012
- Sustainable Lexington Energy Efficiency Video
Lee Cook discusses your most important consideration when replacing your boiler - choosing the proper size boiler.
Lee Cook, owner of CAPCO Energy Supply in Woburn, MA talks about how we can improve our home's energy efficiency, reduce our energy bills, and make our home more comfortable.
sustainablelexington.org
i understood completly everyrhing
thanks, for the informantion
Very informative vid, thanks for posting it. Contractors seem to just want to replace your unit with what you had. I have a 35 year old unit, the house since has had energy efficient windows, siding installed. The boiler is also in a heated space in a lower level closet (high ranch). The old boiler seemed too much for the size of the house and based on fin tube feet in the house it is. Would love to do the heat gain loss calculation but seems difficult.
Your newer boiler is likely to be more efficient than your older boiler. You should take that into account when sizing your boiler. One way to get a handle on the proper size for your new boiler would be to look at how much fuel you burned during the coldest month this last year - then convert that fuel use into average Btu / hour. If you sized your boiler for double that number, your new boiler would be running 50% of the time during the coldest month of the year.
Mark Sandeen Appreciate the suggestion and will look at that, is there a way to differentiate the gas being used for the water heater ? Regarding replacements capacity right now this is what I’m thinking: I am trying to size a replacement boiler for my house it is in the lower Hudson Valley in NY. (20 miles outside NYC) It’s a bi level with 2518 heated square feet I have a 114.5’ of heated fin tube and a Beacon Morris kick panel blower heater that supposedly puts out 12500 BTU on high based on this my demand is about 81,200 BTU. I imagine I would base my sizing on the DOE output number posted by the manufacturer factoring in efficiency of the unit. My current leaking Utica is 150000 BTU input, 124,000 DOE output it lasted about 35 years. Sounds too big, house was built in 1963, vinyl sided double insulated windows now. Boiler is in lower level heated space in a closet. I am going to replace based on my demand using DOE output as the gauge of power, I don’t want to go way over based on the calculation. Thanks again
I have a problem trying to figure boiler size because I did a lot of insulation from 4” to the footing on a full basement to double stud walls with 7” of closed cell foam. I’m going to have a bunch of zones for garage and it’s a duplex. I did most of the work except concrete and some roofing myself. It’s been a long road but we live in one half and I’m heating the other as it’s ready for drywall. We have been using oil with two Toyo Laser 30s burning about 500 gallons a winter. Natural gas is only a little ways and $10 grand up the road and that’s just to the driveway.
so how do you calculate correct size? if its 4 btu per square foot, theres no difference going to each room, and multiplying 4 by x amount of sq in each room.
you still end up with same amount of square feet in the house.
How does a consumer find out the minimum firing rate, it does not seem to be a specification that the manufacturer publishes in their literature or owners manual?
Hi, I like this presentation. Very informative. What is meant by "the boiler very quickly reaches temperature" around 1 minute and 20 seconds? Are you talking about the boiler very quickly producing the heat required for the applicable zone to reach its desired temperature? Thank you!
+Property SEBU The temperature of the water in an oversized boiler too quickly reaches the set point where the boiler stops heating the water. This results in the boiler short cycling - which is not good for efficiency or long-term reliability.
+Mark Sandeen Got it, thanks again! I'm working on a very small garage space that will only require about 6,000 BTU but it seems that boilers aren't produced for such small capacity. So I'm considering a radiant floor system, off of the Domestic Water Heater. If you have any more videos, and particularly catered to smaller loads, I'd love to be forwarded in that direction, thanks!
My boiler takes 45mins to heat up room by 2 degrees on cadithrial ceiling.
How can we do a beat loss test if the boiler is broken? I just bought a home, boiler was working and the next day after closing the boiler is dead... it was a 175k BTU and I got an estimate from a plumber about fixing it. He recommended a new 200k BTU.
You don't need a bigger boiler than the one that was already in the house. A Manual J heat load analysis is based on the size of the house, the size of the windows, and a blower door test to determine the home's air changes per hour. You don't need the boiler to be working to do those calculations.
I am sure you can still buy handbook with all info you need on INPLIX. Just google it.
It is too often heard that “your boiler size is too big, “ this should be told to the plumbers, not the house owners. The plumbers want to make money so, they always install over capacity of boiler to their customers. The plumber treat the homeowner as an idiot
Don't purchase a Crown Boiler, from a Company Called surplus city liquidators, very dishonest, Be careful they , Advertise on AMAZON, BUYER BEWARE