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effeciency vs saving on oil

Keith_8
Keith_8 Member Posts: 399
in THE MAIN WALL
The closer you can get the firing rate to the actual heat loss of the house the better off you wil be.

Assuming you have 100 psi pump pressure, a .65 nozzle will be about 91,000 gross BTU's. Net BTU's will be around 77,000. If your house is no larger than 3000 square feet with average insulation you will have no problem. If you use the boiler for domestic hot water production the recovery rate will not be as great, that should be taken into consideration.

Longer run times will be offset by the lower stack temps. Just make sure that the stack temp does not fall below 350* gross.

Keith

Comments

  • Live/Learn
    Live/Learn Member Posts: 97
    efficiency vs saving fuel

    Dear Wallies, I asked this question last year but I'm still a little confused. If I down fire my boiler from a .85 to a .65 (as my boiler / burner allow) will I save oil? Run time will be longer as fire will be smaller heating the same mass of water and iron.How would I save on oil with longer run times? Does efficiency equal fuel savings? Thanks Live/Learn
  • Live/Learn
    Live/Learn Member Posts: 97
    lowering my firing rate

    Yes Keith my home is well below 3,000 sq. ft. in fact it is around 1,200 sq. ft. I have a Burnham V83 for heat and a Bock for domestic hot water.It makes sense what you state about stack temps. My net stack is around 380-400 with the .65 and around 425-475 with the .85.My pump pressure is set @ 140 for both rates. I have a "wet tester" which I use to setup the system each season. My co2 is usually around 12-13, draft @.01-.02 over fire with 0-1 smoke. I'm a home owner who has been doing his own system for years. I actually enjoy doing it. My wife thinks I'm crazy! Thanks for your reply Keith
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