Baseboard heat with outside reset

kevin coppinger_4

did a fin tube job using reset last month....Sterling kompac baseboard, Buderus 115-21 boiler, Argo DPM-2 reset controller. The system is desiged for -20 F...maybe a bit oversized but it can get that cold here in NH. kpc

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Bob LaRochelle

baseboard heat w/ outside reset

Will a system with an outside temp reset work with baseboard heat or is it really designed for panel rads or in floor radiant? Thanks, Bob

J.C.A._3

It CAN work....

If the system was oversized to begin with, (most are) you'll be able to run it comfortably with lower teperature water. If it's sized borderline, it will work on most days well,as the heat needed was designed for the coldest days,but needs to be programmed to the design temp.

A fine line to be sure....but might be worth the investment. Chris

Dave_4

i run a buderus boiler with outdoor indoor reset on constant circulation and it works good for me on a 20F day i heat my house at 73 with 126F water no problem

i am in Connecticut and my house is 1400sf and i have only used with dhw 56gal of oil per month this year

i will be changing out baseboards in 2 years and install panel rads in the bedrooms. but when i sized my baseboards i over sized them a bit so on a -8deg day i could heat the house at 160F good luck

thanks
Jason

Dave_4

hi keven what water temp did you design for on that job
and what size house is it?

thanks
Jason

Bob LaRochelle

baseboard heat w/ outside reset

Thanks for the replys. I live in central ny and it does get cold here. I believe the figure used in this area is - 10 degrees. It sounds like if the design includes a little more fin and proper design I should be ok.

Boilerpro_3

Outdoor reset will work on any system

All it does is reset the water temperature according to the outdoor temperature. If you need 200F water on the coldest day of the year you set the control for 200F for that outdoor temperature. On warm days it will run the system cooler....and usually the boiler. You gain system efficiency and boiler efficiency no matter at what temperature the system needs to operate.
With a condesning boiler lower water temps are better, but you still come out ahead with a standard boiler.

Boilerpro

Dave_4

depending on your boiler it's good to over size your baseboards so you can use lower water temps but
providing you watch return temperatures if your boiler dose not have low temperature protection then you may need to install a bypass so it will mix your supply with return to protect your boiler. or better yet a primary loop then t off of that with a sec loop for you main heating circuits
pri/sec looping

good luck
Jason

Bob LaRochelle

baseboard heat w/ outside reset

The boiler will be a buderus ga124/23ind tank with their controller. Thanks Bob

Brad White_41

Brookhaven National Labs Study

Was posted here a couple of months ago to assess if OD Reset and with condensing boiler would work on a house designed for 180 degree water and with baseboard. Turns out, countra to popular wisdom, it can and will pay for itself.

If with condensing boilers, the number of hours whereby outside temperatures and their corresponding reset water temperatures over a given winter would be sufficient to condense (highest efficiency) long enough to be worthwhile.

Absent condensing and so long as the boiler, if conventional, is protected from condensing, reset will save money. All systems can benefit from lower media temperatures.

The other points about over-sizing radiation are worthwhile too of course, anything to increase the hours of peak efficiency.

kevin coppinger_4

design....

180F @ -20F.... The house is a approx 1300 sq. ft. ranch two zones ...bedrooms and living area... heat loss was 40K BTU. kpc

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Dave_4

Munchkin Install

I am readying myself to install a new Munchkin 140M boiler and SuperStor 45 Indirect Water Heater heating system in my 2400sf ranch home. The current setup is simple, but woefully inefficient. (Oil Boiler coverted to Gas) It is a Dunkirk 155btu with 3 zones. 3 B&G 100's (all original from 1956) handle the zones. 1" copper piping is original (also 1956) to baseboards throughout the house. Longest run is 100'. My plan is to go primary/secondary using 5 B&G NRF-22 pumps. (1 primary, 3 heating zones, 1 indirect water heater) I have a Honeywell R8888 4 zone Circulator Control w/ Honeywell AQ475 Outdoor Temp Control. Questions:
1. Any concerns regarding pump size on the 140M? Should the primary pump be larger? I have read about the mod/con boilers requiring more gpm than conventional units.
2. Will the controls I have work with the Munchkin and is the outdoor reset worth it? (140M has 925 controls w/o vision)
3. Do I need to include flow check valves on the return for the seconary loop? I am using Check-trol Isolation flanges throughout the system on the pumps.
4. Are circuit setters/Thermoflo valves necessary?
5. Is it better to pipe the indirect water circuit from the primary or the secondary loop? I've seen both.
6. Does the indirect water circuit need its own expansion tank?

I plan to do all of the piping myself, set up the controls, wire everything and then have a certified tech come out to finalize the gas piping, fill, purge and start up the new system. I feel like I have done my homework and have the top of the line in everyhting I am using.

Thanks for providing this wonderful resource. I have used the wall often in planning this project.

Regards,

Eric in Utica, MI
586-703-4076