Posted By SIERRADMAX, Feb 27, 2013 at 7:27 AM

1. #1

SIERRADMAX Feeling the Heat 2. ```NULL ```

Jan 13, 2011
301
25
Loc:
RI
What's a "rough cost" of adding storage to a gassifier aside from the cost of the tanks?

I'm weighing the option of buying a 1000 gallon pressurized tank for use with my econoburn 100. However, with my homes heat loss calculated at 50,000 BTU/Hr, if I am correct, an 8 hour burn should yield 8 hours of useable hot water with a delta T of 50 degrees (190-140)? Effectively cutting my wood consumption in half.

1000 gallons @ 50 degree Delta T = approx. 400,000 BTU's
400,000 BTU / 50,000 = approx. 8 hrs.

To charge: 50,000 BTU (net output after house load) would take 8 hrs. to charge to 400,000 BTU

Obviously I would see better results in warmer weather.

Any thoughts?

2. #2

ihookem Minister of Fire 2. ```NULL ```

Jan 25, 2009
668
43
Loc:
Allenton, Wisconsin
Well, as for me we figured 200 bucks?? for labor and 100 for material was our guess. I have my plumber buddy hook my stuff up so prices may vary cause I give him this green paper tha keeps him coming back. I can't seem to find a decent storage tank though.

3. #3

avc8130 Minister of Fire 2. ```NULL ```

Dec 6, 2010
1,048
95
Loc:
1000 gallons of storage will need ~\$1000 in expansion tanks...unless you go with an open storage system.

You may need another pump ~\$100.

Figure \$200-\$500 for pipes, valves, fittings, etc.

You will NOT burn 1/2 the wood. That math just doesn't work. Each piece of wood you put in has a set amount of BTUs it can give.

1 burn to recharge 1000 gallons of storage from 140-190 will take more than 1 load of wood.

ac

4. #4

SIERRADMAX Feeling the Heat 2. ```NULL ```

Jan 13, 2011
301
25
Loc:
RI
so, maybe a 1/3 less in wood consumption?

5. #5

avc8130 Minister of Fire 2. ```NULL ```

Dec 6, 2010
1,048
95
Loc:
The only change in wood consumption will be in system efficiency. If you can run your system more efficient with storage, you will save that wood.

The overall opinion is that storage is more about convenience than wood savings.

ac

Chris Hoskin likes this.
6. #6

NE WOOD BURNER Minister of Fire 2. ```NULL ```

Dec 30, 2012
754
149
with 1000 gallons of storage. how much expansion volume would be needed? Vertically where would the expansion be placed? above or below the storage tanks?

7. #7

Dec 6, 2010
1,048
95
Loc:

8. #8

Dec 30, 2012
754
149

9. #9

arngnick Member 2. ```NULL ```

Feb 15, 2013
245
28
Loc:
Mansfield, PA
I recently went through all the same questions when I purchased my new boiler and storage. If your stove idles alot it may save some wood consumption, the biggest benefit I see with mine is the fact that the storage will carry you between burnings. Do you keep your stove burning all the time or does it go out and need relit? Here is a link that may help with some of your questions...

http://hillsideenergy.com/thermal_storage.htm

10. #10

Dec 6, 2010
1,048
95
Loc:
11. #11

henfruit Minister of Fire 2. ```NULL ```

Nov 27, 2007
711
33
Loc:
New Hampshire-Maine border
I only use one and it works fine.

12. #12

avc8130 Minister of Fire 2. ```NULL ```

Dec 6, 2010
1,048
95
Loc:
What temp range do you run?

What pressure gain do you see?

13. #13

stee6043 Minister of Fire 2. ```NULL ```

Aug 22, 2008
2,565
244
Loc:
West Michigan
For an existing indoor boiler I don't think you'll ever get a reasonable ROI on storage purely based on wood consumption reduction. As stated above it's primary purpose is convenience, with a slight added benefit of increased efficiency in many cases.

You're not running a 200k btu boiler so your efficiency gains will likely not be huge.

14. #14

maple1 Minister of Fire 2. ```NULL ```

Sep 15, 2011
7,492
1,307
Loc:
Nova Scotia
I've got two stacked horizontal 330 gallon tanks for storage, and a 110 gallon propane tank as a simple non-bladder expansion tank. It sits upright on the floor beside the storage tanks. I run between 8psi cold & 15psi hot. I wasn't sure this would work, but so far so good. My cost for all three tanks was \$780. You won't really see much of a decrease in wood consumption just by adding storage - unless maybe you are comparing to a boiler that spends a lot of its time idling, in which case storage would take the idling out of the equation.

15. #15

peakbagger Minister of Fire 2. ```NULL ```

Jul 11, 2008
3,186
750
Loc:
Northern NH
For me it came down to what would fit in the basement and what I could install and move myself due to lack of assistants. I have an unpressurized American Solartechnics tank. It costs more than a home built pressurized system (based on a non code alteration to an old propane tank) and its legal in all states. I picked it up, hauled it home, carried it down the stairs and installed it myself. It takes up less space as its square and I built a hanging set of shelves on top of it so there isnt a lot of wasted space. With 550 gallons and conventional radiators, I reallize that its only good for one day during cold weather and about 3 days in shoulder season. I have oil backup so if I am gone, oil keeps the house from freezing. Sure if I was building a house and had access to a code tank, I would go bigger and if my surplus PV generation copntinues to climb I may be looking for some electric baseboard to replace the oil.

If my tank floods the basement, I can claim it on insurance, I am not so sure a non code altered vessel would be treated the same by an insurance company.

16. #16

stee6043 Minister of Fire 2. ```NULL ```

Aug 22, 2008
2,565
244
Loc:
West Michigan
Almost any tank can be "legal in all states" when they sit on the manufacturers floor. How they are installed, unfortunately for the DIYer, is equally as important for their ability to meet code. Assuming your installation is cosher based on the fact that your tank was code compliant when it was built and is "approved for use in a hyrdronic system" is a bad assumption to make.

To that end, your home owners policy may or may not cover damage for a failure in this type of system. Assuming your covered for a tank failure is yet another ill advised assumption to make. If you don't have it in writing or specifically stated on a rider it may well be excluded. Especially if any part of your system is not up to code, properly permitted and final inspection approved.

17. #17

tmudd Member 2. ```NULL ```

Jul 30, 2011
44
10
Loc:
Central Missouri Ranch

To the best of boilermen,
TLM

18. #18

SIERRADMAX Feeling the Heat 2. ```NULL ```

Jan 13, 2011
301
25
Loc:
RI
deposit placed onon two 500 gallon tanks. Looks like I'll have a fun summer project!

mikefrommaine likes this.
19. #19

arngnick Member 2. ```NULL ```

Feb 15, 2013
245
28
Loc:
Mansfield, PA
You mean weekend project