boiler controls

Robert O'Brien

and Viessmann are not low mass.I've installed 2 AQ2000's,one on a VR-22,the other on a B10-3 Biasi.Both great so far,but it's only been about 6 weeks

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Dan_15

boiler controls ?

I have been following some of the debate over the system 2000. efficiency.The post purge seems like a big part of the reduced standby losses. Are there systems available for the high efficiency low mass cast iron boilers out there that feature a lengthy post purge? I am aware of the Honeywell AQ2000 . Do the control systems for buderus and viessman or the new slantfin eutectic feature post purge? I would be interested in what folks think is the best boiler control system for my residence im in the Danbury ct area where we get about 6000 degree days/year. I have a 12 yr old oil fired New Yorker steel boiler with a DHW coil and 4 zones . Im just trying to learn what i can when the time comes to upgrade.
Thanks

John Cockerill

Boiler controls


honeywell AQ2000 is a great control. It is new and some folks are hard to change to new control methods.

www.Exqheat.com

Norm Harvey

I dont know that much about the AQ2000 but I found this comparison by Tekmar for the TN4

http://www.tekmarcontrols.com/sb/sb045.pdf

Mike D_7

boiler controls

Mike, I also live in the Danbury area and redid my heating system with a Tekmar 371 and I think it's been working great.
Heat is so even you're never aware of the outside temperature without opening a door to check.
Only have 12 months of operation so far, but energy consumption dropped from about 1,200 gallons of oil December 05 thru Dec 06 down to an estimated 800 gallons December 06 thru December 07. I have used 660 gallons so far, and the tank is reading abour 3/4 full this AM.
I know that year over year isn't too accurate,but I'll check by degree days after my December oil delivery.
Mike D

Dan_15

what kind of system do you now have ? Your results sound impressive.Im running about 1400 gallons/yr. this included DHW?
Mike

Dan_15

Thanks, I have been looking at The Biasi. Do you have much experience with these boilers? Are your customers happy with them> Iy sense is that they fall in to the lower end of the price range for tripple cass low mass. Iam I correct in this assumption> the biggest factor driving my decision when and whether to upgrade my system is installation cost. ( this is the biggest driver in any payback calculation)I would appreciate your input
Thank You
Mike

Mike D_7

Current heating system

Mike, I have an oil fired Burnham MPO84 boiler and a 40 gallon Weil-McLain indirect hot water storage tank. The system is set up as a primary/secondary system using a small injection pump to feed water to the secondary system. A Caleffi HydroLink seperates the primary from secondary sides with a couple of stubs availible for future hot tub/heated sidewalk, etc.
There are three zones controlled by zone valves on the secondary side. The overall system is controled by the Tekmar control. It uses outdoor reset and indoor feedback to set system temperatures.
The system supplies heat and DHW for a 2,500 sq foot raised ranch. It's a 1970's contemporary kit house (by Deck House). Exterior walls are better than 50% glass. Ceiling height on the main floor slopes from 8' to 11'. No attic or basement.
There's only two of us with occasional guests, so DHW demand isn't too great.
The old system was a triangle steel boiler which the previous oil service company had derated from 1.25 gph down to 1.0 gph.
Mike D