Domestic Hot Water Coil

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brokenyoyo
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Posts: 13
Joined: Sun. Jun. 08, 2008 8:34 pm
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Econo
Location: central maine

Post Sun. Jun. 08, 2008 8:45 pm

Hi I bought a house this past sept and the house has solar hot water, there is a solar sepco tank in the basement. Im going to get a coal stove soon and am wondering if I get the domestic hot water coil how can I connect the hot water coil to my water tank? How can I have two inputs to the tank? Also the tank is not wrapped with insulation, I was told if I wrapped the tank I might have condensation problems Is this true? Thanks Dan

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Yanche
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Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea
Location: Sykesville, Maryland

Post Sun. Jun. 08, 2008 10:19 pm

I'm not familiar with the sepco tank but I looked at the specs on the web site. http://www.vaughncorp.com/html/solar.html Looks like it has an internal heat exchanger. Does your solar heating system work? Do you plan to keep it? There are several ways to pipe the hot water tank to a coal boiler or stove. We need to know the relative capacity to produce domestic hot water solar vs. coal stove. Will one be primary and the other a backup? Solar a pre-heater? Etc.
Yanche
Alternate Heating Systems S-130
Stoker Boiler burning Anthracite Pea Coal

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Lumberjack
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Post Mon. Jun. 09, 2008 10:02 am

Assuming a closed solar system with a exchanger coil you have two basic choices. Pipe the boiler in parallel with the solar or tie the boiler directly into the hot water supply. The closed system of the solar likely has antifreeze in it and the boiler temps will ruin the glycol very quickly so I don't think you really want to go this route. Also directly heating the domestic water cuts out the exchanger and its inherent losses.

Also you need to consider how to regulate the system. Solar runs at much lower tempatures then the boiler will. You will actually lose heat through the heat exchanger from the hot water tank to the solar system if you don't have your controls and sensors setup right.

A two tank system would open up a few options for you such as using the solar as a preheat and the domestic as a final stage.


brokenyoyo
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Posts: 13
Joined: Sun. Jun. 08, 2008 8:34 pm
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Econo
Location: central maine

Post Mon. Jun. 09, 2008 9:20 pm

I don't know much about the system, so I called a solar power company close by and asked how much it would cost to have them come look at it. I described the system to him over the phone and he said a solar sepco tank with two panels on the roof would not be very efficent and was done by somebody that did not know what they were doing. Probably the old home owner .And any heat generated by just two panels would be marginal. He also said if the pump was no good it would be about 300.00 to replace. I doubt it would be worth fixing if it were broken. So I don't have the money right now but hope to have it looked at in a couple of months And Im sure he would know if I could connect a domestic hot water coil. So thanks for your input Dan

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Yanche
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Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea
Location: Sykesville, Maryland

Post Mon. Jun. 09, 2008 9:35 pm

If you abandon your solar hot water heating system you could use the sepco tank as an indirect hot water heater. Do you have another way of making domestic hot water? Just two solar panels would not make much domestic hot water. Coal stoves can produce some hot water but depending on the firing rate of the stove and water need it's best used as a pre-heater to another domestic hot water heater.
Yanche
Alternate Heating Systems S-130
Stoker Boiler burning Anthracite Pea Coal

brokenyoyo
New Member
Posts: 13
Joined: Sun. Jun. 08, 2008 8:34 pm
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Econo
Location: central maine

Post Mon. Jun. 09, 2008 9:48 pm

I will keep the system it does make hot water but I don't know if the hot water is made from the solar panel or from the electric back up. Its all I have for now. Hope to have it looked at soon. Thanks Dan


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Lumberjack
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Post Mon. Jun. 09, 2008 10:18 pm

Lets try this again.

How big are the panels?
Is this an open or closed loop system.
Is this a drain back system?
Is the solar water tank separate from the electric tank?

The pump normally used does not often fail. A good internal cleaning and or a new impeller frequently is all that is needed to fix things.

kruegeua
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Joined: Fri. Jul. 04, 2008 11:27 pm
Stove/Furnace Make: sepco tank

Post Fri. Jul. 04, 2008 11:35 pm

You can set up solarpanels( for summer) and a coil in a woodstove ( for winter) using same plumbing with one pump and one controller.
2 4x8 panels make plenty of hot water in 80 gal sepco tank. To see my system provide your phone number for contact.

CapeCoaler
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Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post Sat. Jul. 05, 2008 12:15 pm

If the solar system is good and needs no major repairs a second storage tank would be best.
Test your system by switching off the heating element circuit to the hot water tank.
An electric water heater tank will do an excellent job for your coal water coil.
The solar tank is the #1 tank, it takes in the cold street/well water, the coal tank is the #2 tank and takes in the warmed #1 tank water.
Some valves to do the switch over between summer and winter will be needed.
During high summer operation the solar can heat both tanks and the coal will be off.
Late spring/early fall solar heats the #1 tank and coal will warm the #2 tank.
Winter solar just warms #1 tank and coal heats #2 tank.
If you have separate electric and solar tanks now plumb the coal coil to the electric tank as it should be #2.
If you have electric heat elements in the Sepco tank disconnect them and wire the new electric tank.
Some pictures of the current setup and more information regarding the current setup will get you more help.
I am not an engineer, train or otherwise!
I stay at a Holiday Inn at least once a year!
Most of all I do have common sense and a practical application of logic.
Oh, add humor, on the dry side, along with a wee bit 'o sarcasm.

CapeCoaler
Member
Posts: 4433
Joined: Sun. Feb. 10, 2008 3:48 pm
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post Sat. Jul. 05, 2008 12:19 pm

Some good basic info available on this site for solar heating.
http://www.radiantsolar.com/index.php
I am not an engineer, train or otherwise!
I stay at a Holiday Inn at least once a year!
Most of all I do have common sense and a practical application of logic.
Oh, add humor, on the dry side, along with a wee bit 'o sarcasm.

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