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  1. #27
    Join Date
    Jan 2004
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    Lancaster PA
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    67,750
    Quote Originally Posted by dan sw fl View Post
    No, but it may very well get one operating times that MANY would Not be real pleased with.

    OR a calculated 100,000 * 1.66 ... 166,000 .:. you can have at least 2 units.

    Are mechanical contractors now selling 2 for 1 [ BOGO ] like you see in the grocery store?
    I'll plan on the _GET ONE_ when my neighbor does the _BUY ONE_ portion.

    Do you even have boilers in Florida. LOL

    Seems many contractors still like to use the finger sizing rule. Stand across the street. hold your hands in front of your face at arms length. How ever many fingers it takes to cover the house, is how many sections the boiler needs to be. Not too many houses a 10 section won't heat. LOL
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  2. #28
    Join Date
    Nov 2004
    Location
    SW FL
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    6,243
    Quote Originally Posted by beenthere View Post
    Do you even have boilers in Florida. LOL

    Seems many contractors still like to use the finger sizing rule. Stand across the street. hold your hands in front of your face at arms length. How ever many fingers it takes to cover the house, is how many sections the boiler needs to be. Not too many houses a 10 section won't heat. LOL
    HELL Yes, we have boilers. However, I much much more prefer BBQ to those damn old oil fryers.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  3. #29
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    280

    Well

    Quote Originally Posted by Edgeman View Post
    From *removed link to HVAC Forum*

    Applying Brad's formula:
    BTHU = (Annual Fuel usage/0.6)*(house temp-design temp)*efficiency*fuel heat value)/HDDx24

    Where:

    68 house temp that we set to
    9 design temp from gov data
    0.79 efficiency from energy audit
    138690 fuel heat value for #2 diesel
    775 fuel usage from energy audit/oil company logs
    4753 Heating Degree DaysHDD from gov

    yields = 73,197 BTU loss per hour

    That 79% efficiency number is probably closer to 60%, use that instead.
    The .6 you have after annual fuel usage can be adjusted based on solar gains and other incidental gains according to Brad. If you change it from .6 to .75 the heat loss comes much closer to reality.
    My condensed version of 55 x gallons used = heat loss works for Long Island, your house is maybe 60 miles from mine.
    They don't make an oil fired boiler small enough for the majority of homes on Long Island. The heat loss on your house is around 40,000 (I have a 1900 sq. ft. ranch too).

  4. #30
    Join Date
    Feb 2013
    Posts
    20
    I need to get a min 90% AFUE to get the $750 rebate. Quotes for the TT Prestige Primax Excellence or a mod-con with an indirect is so expensive $$$ I am considering to buy a mod-con with a conventional 50 gallon tank to cut the cost. Thoughts?

  5. #31
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    280
    The latter will create venting issues, your not supposed to vent "orphaned" water heaters into a masonry chimney. People always get hung up on the rebate money, get a conventional gas boiler with an indirect water heater if you don't want to spend the extra money.

  6. #32
    Join Date
    Feb 2013
    Posts
    20
    Quote Originally Posted by R Mannino View Post
    The latter will create venting issues, your not supposed to vent "orphaned" water heaters into a masonry chimney. People always get hung up on the rebate money, get a conventional gas boiler with an indirect water heater if you don't want to spend the extra money.
    Well then it becomes a cost problem because I may then have to line my Chimney stack for the lower temp gas venting which would be a prohibitive $1. Mod-cons have come down in price over the years so that it doesn't pay to get a conventional broiler when you switch from oil to gas with all the cost and incentives. The Navien looks like the lowest price point to effect the changeover.
    Last edited by Chris_Worthington; 02-25-2013 at 12:14 PM. Reason: Pricing Removed

  7. #33
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    280
    A conventional gas boiler would need a chimney liner as well. FYI

  8. #34
    Join Date
    Feb 2013
    Posts
    20
    Quote Originally Posted by R Mannino View Post
    A conventional gas boiler would need a chimney liner as well. FYI
    That's what I'm citing as an added expense that makes going the mod-con route a better choice because you don't have to use your stack.

  9. #35
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    280
    Quote Originally Posted by Edgeman View Post
    That's what I'm citing as an added expense that makes going the mod-con route a better choice because you don't have to use your stack.
    Good, because to play the game effectively you have to know the rules.

    I vote for a Triangle Tube Solo 60 with the appropriately sized indirect coupled to it, but everyone likes something different.

  10. #36
    Join Date
    Feb 2013
    Posts
    20
    R, I really appreciate your input. I'm going to nix the Navien CH210 Combi idea. The initial contractor came in with that and I asked him to rework the proposal with a AFUE 90+ boiler with an indirect and he suggested a Wiel-McLean GV90+5 with a Aqua Plus 55. I suggested a GV90+4 and a Aqua Plus 45. The boiler has a cast iron heat exchanger. Also considering a TT prestige Trimax Solo 110 with an indirect but they are more $$. Th eSolo 60 may be at the threshold when mating with the 45 gal indirect. Another contractor is coming by this week to talk about the Viessmann Vitodens 100.

  11. #37
    Join Date
    Nov 2011
    Location
    Long Island, NY
    Posts
    280
    The TT60 would drive a 45 gallon indirect just fine for a four person household (we don't have any big Jacuzzi's in that ranch do we?). I happen to be a big fan of the Vitodens 100 and we usually couple them to a 32 gallon indirect. The mod/cons are pricey but we have to put a lot of different components together to make a heating system.
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  12. #38
    Join Date
    Feb 2013
    Posts
    20
    Looks like I'm looking at the TT CC125s (aluminum heat exchanger) with the TT Smart 40 Indirect Hot Water Heater vs. Weil McLain GV90+4 with the Weil McLain AquaPlus 45 Indirect hot water tank which is 5% cheaper. The GV90+$ has a cast iron heat exchanger. Will this have a longer life? Which one would you choose. The contractors are suggesting the the TT Prestige 60 is too borderline with the indirect tanks. Thoughts?

  13. #39
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,750
    If you get the 60, just get a smaller indirect. no problem then.
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