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Tool Talk Discussion Forum

Oil Fired Hot Water Boiler Question

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Red Dave

04-30-2004 08:53:26




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I need to replace the oil-fired hot water boiler at my Mother's house (she's 81).
The quotes I recieved have specified my choice of either a steel boiler or cast iron boiler. I wasn't even aware that a steel boiler was available, but since it is $500 cheaper, it has caught my attention.
Is a steel boiler a good choice?
Is there any advantage to either steel or cast in terms of efficiency?
Will a steel boiler last as long or longer than a cast iron boiler?
My gut reaction is to go with cast iron, but is it worth an extra $500?
Thanks for your insights and the benifits of your expertise.

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pg

05-01-2004 03:15:47




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 Re: Oil Fired Hot Water Boiler Question in reply to Red Dave, 04-30-2004 08:53:26  
dont use a water heater for heating a whole house, the BTUs are not enough. and recovery will be very slow. can only use one for one or two small rooms. pg



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pg

05-01-2004 03:13:04




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 Re: Oil Fired Hot Water Boiler Question in reply to Red Dave, 04-30-2004 08:53:26  
most gas or oil fired boilers with natural draft are all about the same. insulation in the house will make the most difference. cast iron will hold the heat alot longer. the simpler it is , the easier it is to work on. as long as the boiler is sized correctly , it will work correctly. oversize and you waste alot. undersize and it wont keep up with the demand. pg



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buickanddeere

05-01-2004 17:34:59




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 Re: Re: Oil Fired Hot Water Boiler Question in reply to pg, 05-01-2004 03:13:04  
I was thinking of a separate hot water heater to replace the boiler rather than tapping into the domestic hot water. I'm not a big fan of running a stead stream of new untreated water through a heating system. Unless the house if huge, full of airleaks or in the frigid far north even a commom 50,000 btu will do. My forced air 30KW/102,000 system ran less than 50% duty cycle during the worst of last winter with a 3000 sq ft house. Hot water heaters larger than 50,000 btu are commonly available.

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paul

05-02-2004 20:18:04




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 Re: Re: Re: Oil Fired Hot Water Boiler Question in reply to buickanddeere, 05-01-2004 17:34:59  
Don't quite understand? A water heater pre-heat option is generally a coil inside the boiler, not just tapped into the furnace!

A 50,000 btu unit would maybe heat my house to 40 degrees in a typical January. Last year was colder than typical, got to -28 a few nights. The 105,000 btu oil boiler I have had difficulty keeping the house at 65. The old cast iron wood boiler, unfortunately, broke last fall so I couldn't use it, but also was rated at 100,000btu.

--->Paul

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buickanddeere

05-02-2004 21:34:25




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 Re: Re: Re: Re: Oil Fired Hot Water Boiler Questio in reply to paul, 05-02-2004 20:18:04  
Sounds like one of those commercial 100-125,000 btu commercial hot water heaters would be in order. And just use a separate small heater for domestic hot water. The big one won't need to run during warm weather. Nursing homes, hotels, car washes etc use the bigger commercial units. Price is decent too.



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paul

05-03-2004 10:31:15




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 Re: Re: Re: Re: Re: Oil Fired Hot Water Boiler Que in reply to buickanddeere, 05-02-2004 21:34:25  
Got a pretty good Valiant oil fired water boiler (they seem to be called that, tho there is no steam involved - just warm/hot water). Am getting a Harman wood fired water boiler to replace the old cracked cast unit. Where I live, it would be difficult to find anything under 90,000 btu. Just the difference in climate. :) The industrial units would start at 480,000 btu & go up from there.

Hot water is supplied by the 80 gal electric water heater the REA coop sold & installed for $120. Lifetime warrenty. They put a controller on it & use them to maintain their peak demands, generally turning it on over nite & off during the day. It's a pretty good program, a gas water heater is cheaper to operate but no cheaper to buy, & when one doesn't have gas....

--->Paul

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buickanddeere

04-30-2004 14:17:01




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 Re: Oil Fired Hot Water Boiler Question in reply to Red Dave, 04-30-2004 08:53:26  
Many times now just an ordinary oil fired hot water heater gets installed instead of a "boiler".



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Red Dave

04-30-2004 17:32:04




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 Re: Re: Oil Fired Hot Water Boiler Question in reply to buickanddeere, 04-30-2004 14:17:01  
OK, I have to show my ignorance by asking, What is the difference? They both just heat water and circulate it don't they?
Should I be wary of "just an ordinary oil fired hot water heater"?



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Bob

04-30-2004 09:27:44




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 Re: Oil Fired Hot Water Boiler Question in reply to Red Dave, 04-30-2004 08:53:26  
Generally, cast iron is thought to be longer lived, and steel a bit more fuel efficient, but there's a lot of newer product on the market that blurs or reverses those distinctions.

What brand names did you get quotes on?



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Red Dave

04-30-2004 10:23:52




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 Re: Re: Oil Fired Hot Water Boiler Question in reply to Bob, 04-30-2004 09:27:44  
The steel one on the proposal is a Thermo-Dynamics with a "limited lifetime warranty". The cast is a Crown and also has a "limited lifetime warranty" on the cast heat exchanger.
Not sure exactly what is covered in each one by the term "limited lifetime warranty".
Both are supposedly made to ASME standards.



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Jay

04-30-2004 15:12:45




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 Re: Re: Re: Oil Fired Hot Water Boiler Question in reply to Red Dave, 04-30-2004 10:23:52  
How about you go right to the source?

Link

Link

Both places should give full specs, energy-star ratings and detailed warranty info.



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Red Dave

04-30-2004 17:25:06




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 Re: Re: Re: Re: Oil Fired Hot Water Boiler Questio in reply to Jay, 04-30-2004 15:12:45  
Thanks, I'll check those out, but I hoped to get an opinion on steel vs cast from somebody who has first-hand experience with them.



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