massive gas usage ..... HELP!


  #1  
Old 01-09-06, 09:30 PM
skipdow
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massive gas usage ..... HELP!

I have a 3500 sq ft house with a 700 sq ft cottage out back
the cottage has a new 50,00 btu furnace and new hwt, very mild usage by tenant.
The main house has a 120,000 btu boiler 84% efficiency that also feeds indirect hot water. there are two gas fireplaces that are only used maybe once a week for about 2 mnths a year.

LAST MONTH I USED 55 GJ OF GAS!!!!! and last year was 43GJ for dec.

the house is well insulated with double glazed windows and not drafty
I'm lost...... I don't smell gas leaks...... I ... I... help!
 
  #2  
Old 01-10-06, 10:32 AM
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55 GJ? What does the GJ stand for?

You check your heating degree days? It maybe higher this year vs last year.
 
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Old 01-10-06, 02:55 PM
skipdow
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temp diff

last year 2deg cels this year 5 deg cels
I live in vancouver BC which is a mild climate similar to seattle wash.
This is a constant prob that I have been unable to figure out for a couple years... its only become very urgent as the gas prices go higher
 
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Old 01-10-06, 02:57 PM
skipdow
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sorry 55 GJ means 55 gigajoules of natural gas... thats how its measured. I know someone with a similar house who only used 13 GJ.
55 Gj cost me 780 dollars last month
 
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Old 01-10-06, 05:58 PM
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Ok, I don't know how GJ is messaured.. But I did look at the weather for your area, to day this year you have 22 degree heating days, last year at this time you have 36. so your heating degree days is lower this year vs last year.

What temp/pressure is your boiler running at?

Same number of people in the house hold?

When was the last time you had your boiler/furnace looked at?
 
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Old 01-10-06, 11:45 PM
skipdow
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boiler is running at 180
gas pressure was just checked and is at specs 4 inch (??)
water pressure i'm not sure but it is regulated
the expansion tank is good
there are the same # of people

we did have a theory that the regulator (gas) was defective and was giving 2 lb gas to the boiler but checked and its ok
we keep the house cool around 67 deg f
 
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Old 01-11-06, 06:07 PM
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GigaJoules

If my conversion is right, 1 GJ equals about 9.48 therms or 948,000 BTU. At 120,000 BTU/hr input, you would have had to be firing the boiler for 434.5 hours to burn 55 GJ. This amounts to 14 hours/day for the 31 days in Dec. Something isn't right. Any chance of a major water leak anywhere?
 
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Old 01-11-06, 07:20 PM
skipdow
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none that i've found... i have a crawlspace under the house with no sign of water and inside the house is no sign of water
 
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Old 01-12-06, 04:59 PM
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I dunno

All I can suggest is to have each appliance checked & shut off all the gas appliances connected to that meter & watch the meter. Any meter movement would indicate a gas leak.
 
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Old 01-13-06, 10:38 PM
skipdow
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bypass valve

I have been doing some reading (dangerous i know) and I believe my problem "may" be my bypass valve is set wrong. apparently it can affect the efficiency of the boiler..... sooooo
I want to find out what it should be adjusted to or how to figure out if it is set wrong. any aggreement?
 
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Old 01-14-06, 04:22 PM
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By-pass valve

Even a grossly maladjusted by-pass valve won't have the kind of effect on gas useage you are experiencing. The purpose of a by pass is usually to maintain at certain minimum temperature water returning to the boiler. This temperature is usually around 140.
 
 

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