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Old 01-21-2009, 01:47 PM   #1
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Keep circulator running?


Good afternoon;
I have hot water, gas fired heat with old fashioned radiators (not baseboard).
I have been wondering for some time whether I would save energy if I allowed the water circulator pump to continue running for some time after the burner shuts off.

I am using a programmable thermostat that has an automatic heat anticipator program.

Thanks for your advice

FW

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Old 01-21-2009, 02:30 PM   #2
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Keep circulator running?


Not really.

If it runs too long, you start to remove heat from the house.

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Old 01-21-2009, 06:09 PM   #3
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Keep circulator running?


once the stat satisfies the boiler shuts down if you over road the relay for the circ pump you would over heat the space slightly.then as stated start to cool the loop water back into the boiler costing more to heat on the recycle of the next heat call.insulation behind those radiators to reflect the heat and adding a flue damper that shuts off when the boiler shuts off might be considered
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Old 01-21-2009, 08:07 PM   #4
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Keep circulator running?


the more dangerous part is you may drop the boiler temp far enough to cause condensation in the chamber this would prematurely rust out the boiler.

I am assuming this is a cast Iron boiler.
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Old 01-22-2009, 11:05 AM   #5
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Keep circulator running?


Thanks for your advice guys;
I love this kind of answer, since it means that I need to do nothing. If I might have saved energy by changing the way the circulator runs, I would have had to purchase and install the device.
I will look into heat reflectors for the radiators; especially the one in the dinette, which is built into the wall and is over a crawl-space, no basement. There is insulation under the floor, but the area doesn't get enough heat from that rad.

Thanks again.

FW
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Old 01-22-2009, 11:29 AM   #6
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Keep circulator running?


I Googled "radiator reflector" and found someone's personal web where he describes building a simple reflector to put behind the radiators by attaching a car windshield sun shield to cardboard.
Sounds like a really simple and effective solution; Only problem is, try finding a sun shield in the middle of winter!
I am still searching online for one.

FW
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Old 01-22-2009, 06:05 PM   #7
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Keep circulator running?


HD has sheets of foil faced styrafoam you can cut to fit the back of the radiators its cheap and easy.to make them look somewhat neat you could wrap them in some type a fabric color to blend in.....foil side out to the room. that radiator in the wall over a crawl is restricted by being in the wall....might consider (in the spring/summer)removing it from the wall and running a full lenght of nice clean Slant/Fin baseboard the lenght of that outside wall there.

Last edited by biggles; 01-22-2009 at 06:10 PM.
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Old 01-22-2009, 07:02 PM   #8
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Keep circulator running?


Quote:
Originally Posted by biggles View Post
...might consider (in the spring/summer)removing it from the wall and running a full lenght of nice clean Slant/Fin baseboard the lenght of that outside wall there.
Mixing copper radiators with cast iron can cause balancing (and corrosion ) problems.
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Old 01-24-2009, 08:48 AM   #9
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Keep circulator running?


Quote:
Originally Posted by biggles View Post
HD has sheets of foil faced styrafoam you can cut to fit the back of the radiators its cheap and easy.to make them look somewhat neat you could wrap them in some type a fabric color to blend in.....foil side out to the room. that radiator in the wall over a crawl is restricted by being in the wall....might consider (in the spring/summer)removing it from the wall and running a full lenght of nice clean Slant/Fin baseboard the lenght of that outside wall there.
Being more of an electrician (not licensed<g>) than a plumber, I don't think I would want to touch the heating system, although about 30 years ago a friend and I installed a new gas fired hot water furnace. I would never have done it without my friend, who is a lot better with that kind of work than I.

Our radiators are 80 years old, so trying to attach new fitting to the old would be a job in itself, although I believe that this particular radiator might have been installed later. It has copper pipe running to it.

I don't think I will be able to get styrafoam behind the radiator, since it's in the wall (sort of) and whatever I put behind is going to have to be able to bend easily to get up there.

I have been looking at sun shields used on automobile windshields, but I can't find any around here now, since it's winter. I was going to order a couple from Amazon.com, but shipping would have cost as much as the item!

FW

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