Poconoeagle wrote:Water flowing to fast?
Choke the flow a wee bit to allow more time for heat transfer?
WNY wrote:Yes, typically 170-180 is correct.
Whats' your aquastat on the boiler set for? maybe it's a little out of adjustment?
Maybe reduce your draft to .04 or . 03, you may be loosing heat up the chimney.
Yes, see if you can slow the flow down a bit, so the boiler has time to recover or turn a couple zones down a bit in temp and see if it can keep up or at least start to raise in temperature. You may have to tweek it a bit to get it running in its sweet spot.
At a full burn, typically 1/2" of ash at the end of the grate is normal.
Make sure you ONLY Adjust feed 1/2 turn at a time and check after a couple hours, Coal and stoves/boilers take time to readjust.
A little more info or a pic of your setup would be helpful..
franco b wrote:Always good to have more information.
What is the stack temperature measured with a magnetic thermometer about a foot from the breech of the boiler. It is possible your draft is too high and wasting heat. Excessive combustion air will also drive up stack temperature. The boiler needs time to absorb the heat from flue gas and if the velocity is too high it can't do it.
100 pounds a day to heat 1800 ft. seems excessive. Is that 1800 ft. plus the basement? If the basement is not included there will be the heat loss from the boiler and distribution pipes.
What kind of house and how tight and how well insulated.
Unless an independent agency certifys output, makers are free to claim whatever they want as to output, and they do. In addition your figures make no allowance for efficiency which is not 100 percent. So it is even worse.
stoker_RI wrote:I have the same boiler...with the same issues ....and get the exact same results you are getting, and there are others also with similar issues...I have had the boiler since Spring of 2011...but last year wasn't a REAL New England Winter...so this year is the real test.
I can give you a couple of suggestions based on my experience....Turn the screw in a bit more and forget about seeing ash on the end on the end of the grate...let the fire go right up to the end of the carpet...if you waste a little coal dropping off, so be it..you may have to live with that for the time being through this cold snap, but you will get a bit more btu' s.
Do you know what your return water temp is? If the water is going out at 150, most would agree that optimally you don' t want to see the return water temp more than 20-30 degrees lower...having said that, if you REDUCE the flow to the zones, that will result in even Lower return water temps, and therefore slamming the operating temp of the boiler even more!
What is your low and high set at on the aquastat on the boiler? in your situation, I would suggest 170 low and 190 high
hope that helps!
"Supply 152 return 129"
feel free to PM if you like!