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Posted by Steve Scott on October 19, 2006, 9:54 pm
Replace your boiler. The thing is an antique. Consider a modulating
condensing boiler with an indirect fired water heater. With what
you're paying in fuel now you'll pay for the investment in short
order.
On 19 Oct 2006 18:31:14 -0700, warrenshudson@gmail.com wrote:
>I have a quick question. I have talked to several local hvac
>companies, and I really need a second opinion. Have a 4400 sf brick
>home, outside of detroit mi. There is a 1955 US Radiator 200,000 btu
>hot water boiler in the basement now, 3 zones, 3 b/g circulators, and 6
>relays (3 24v coil relays for the circs. and 3 110v relays for the
>burner). The furnace was initially oil burning with a domestic
>tankless coil in it. The boiler was switched to gas in the 1980s.
>After the switch, an electric water heater was installed, and the
>tankless coil was left disconnected from water. When that electric
>water heater went, it was replaced with a normal gas unit. Now- The
>question:
>I want to re-use that tankless coil to heat water ONLY during the
>winter and ONLY for half the house (kitchen, laundry- high temp.) Now I
>dont mind opening and closing a few valves every spring/fall, but the
>question is how do I have the HVAC co set up the aquastat. I assume,
>that originally, the boiler had a triple aquastat which kept the boiler
>"warm" year round. Now there is a single aquastat, acting as a "high
>limit" set to i think 160 degrees. The burner and aquastat only get
>power when a circulator/zone is active. Since i shut the boiler down
>during the summer, do I want a triple aquastat installed, or should I
>just feed the existing aquastat 24v 24/7 during the winter ? I know
>that years back, the space heating operated on the high portion of the
>aquastat, and the water heating operated on the low side, since it
>represented such a small load, but since I have a large hot water
>demand, can I just run the boiler at one temperature (160-180) Thanks a
>lot, I appreciate the help. Also- when i have my hvac co come out and
>replace the aquastat and hook up the plumbing, has anyone had good luck
>with a particular brand of aquastat?
--
If a tree falls in the woods and kills
a mime, does anyone care?
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