annelisemcl
New Member
Hello all! Please help me make the efficient choice.
Here are the stats:
- Alpine mod con Propane boiler 150,000 95% AFU installed 2011
- Suburban Philadelphia temp zone
- ranch home slab on grade with an internal mechanics room concrete slab containing the boiler, current 80 gal WH, & electrical panel
- run the boiler maybe 5-6 months total during the year as we supplement heat with a soapstone woodstove & I make everyone put on socks & sweaters
- Propane cost per gal = $2.49 (underground storage tank)
- electricity cost per kwh = 0.20
- Daily average total water use is 85 gal (family of 4). I do not know how much of this is hot water.
Estimated Costs:
$4118 - 50 gal indirect tank Alpine Alliance SL - cost + install + 2 year install warranty plus US boiler limited lifetime tank warranty
verses
$1600 (internet estimate tank only no supply price + install quote yet), 80 gal AO Smith Conservationist electric .95 energy factor
or
$960 (internet guestimate tank only no supply price + install quote yet), 80gal Bradford White High Efficiency Energy Saver .91 energy factor
Is it accurate to break the kwh vs lp to btu cost in the below manner?
With 1 gal of LP = 91,333 btu & 1kwh of electricity = 3412 btu, would that mean it would take me 26.77 kwh of electricity to equal 1 gal of LP?
At my current prices am I correct in thinking that 1 gal of LP at $2.49 is a lower cost than the equivalent btu's from kwh cost of $5.35?
If this is correct, does this mean that a 50 gal indirect tank on my Burnham Alpine ALP150W-2L02 boiler running those 6 months in the summer still would be less expensive than the operating cost of an 80 gal electric water heater with a .91 or .95 EF for 12 months?
I feel as if I am missing something or not delving deep enough into the algorithm to have a true comparison.
I am getting a bit panicked that I need to make a decision (very slow leak from my 16 yr old BW) and I want to make the most efficient least wasteful choice I can.
Thanks,
Ann Elise
Here are the stats:
- Alpine mod con Propane boiler 150,000 95% AFU installed 2011
- Suburban Philadelphia temp zone
- ranch home slab on grade with an internal mechanics room concrete slab containing the boiler, current 80 gal WH, & electrical panel
- run the boiler maybe 5-6 months total during the year as we supplement heat with a soapstone woodstove & I make everyone put on socks & sweaters
- Propane cost per gal = $2.49 (underground storage tank)
- electricity cost per kwh = 0.20
- Daily average total water use is 85 gal (family of 4). I do not know how much of this is hot water.
Estimated Costs:
$4118 - 50 gal indirect tank Alpine Alliance SL - cost + install + 2 year install warranty plus US boiler limited lifetime tank warranty
verses
$1600 (internet estimate tank only no supply price + install quote yet), 80 gal AO Smith Conservationist electric .95 energy factor
or
$960 (internet guestimate tank only no supply price + install quote yet), 80gal Bradford White High Efficiency Energy Saver .91 energy factor
Is it accurate to break the kwh vs lp to btu cost in the below manner?
With 1 gal of LP = 91,333 btu & 1kwh of electricity = 3412 btu, would that mean it would take me 26.77 kwh of electricity to equal 1 gal of LP?
At my current prices am I correct in thinking that 1 gal of LP at $2.49 is a lower cost than the equivalent btu's from kwh cost of $5.35?
If this is correct, does this mean that a 50 gal indirect tank on my Burnham Alpine ALP150W-2L02 boiler running those 6 months in the summer still would be less expensive than the operating cost of an 80 gal electric water heater with a .91 or .95 EF for 12 months?
I feel as if I am missing something or not delving deep enough into the algorithm to have a true comparison.
I am getting a bit panicked that I need to make a decision (very slow leak from my 16 yr old BW) and I want to make the most efficient least wasteful choice I can.
Thanks,
Ann Elise