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  1. #1

    Tankless Water Heater and Air Handler

    Hi,

    Mindful of the pros and cons expressed on this site, I plan to install a tankless water heater in my home. Like my present water heater, my gas furnace is also on its last legs. I am thinking of installing an air handler instead of a new furnace, and having the air handler warm the air with hot water from my tankless. I am told it is best to install a commercial tankless to do this job (which I am fine with). Apart from that, does anyone have any thoughts/concerns about making this transition? As you can probably tell, I'm an HVAC neophyte.

    Thanks kindly for all responses.

  2. #2
    This sounds like buying a 4cylinder car for economy and putting a C5 jet engine in it.

  3. #3
    Join Date
    Jan 2004
    Posts
    48
    Would rather see a Munchkin boiler with indirect water heater and hydronic fan coil, all components are long service life and designed for the job at hand. Would outlast by a factor of 3
    Class of 70

  4. #4
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    76
    Quote Originally Posted by tuckerin View Post
    Would rather see a Munchkin boiler with indirect water heater and hydronic fan coil, all components are long service life and designed for the job at hand. Would outlast by a factor of 3
    The two hot water fan coil units with DX cooling I've seen are rather expensive. I recently had a project in a hospital where I needed to spec exactly that, and I only found AAON and First Company that made them. Do you know of any others?

  5. #5
    Join Date
    Jan 2004
    Posts
    48
    I have used the First Co. units on the residential jobs, didn't find them expensive, about half the cost of a gas high end furnace. Used airtherm units in church jobs and hospital additions. The good systems cost a bit more and should outlast the mortgage IMHO. I check out my prospective customers and when I hear "how much" three times in the first ten mins. I leave them to the bottom feeders.
    Class of 70

  6. #6
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    76
    Thanks for the info. I'll call my Carrier rep since they handle First Co and see what the price is. I believe the contractor just priced out the Aaon unit and it was really high. I didn't actually see the bid, but that client doesn't usually complain about price so it must have been bad.

    Looks like those Airtherm units are chilled water, not DX. The problem with this specific job is that they need cooling almost year round and chilled water isn't available from November through March.

    I'll stop hijacking this thread and investigate the First Co units further.

  7. #7
    Quote Originally Posted by swarwick View Post
    Hi,

    Mindful of the pros and cons expressed on this site, I plan to install a tankless water heater in my home. Like my present water heater, my gas furnace is also on its last legs. I am thinking of installing an air handler instead of a new furnace, and having the air handler warm the air with hot water from my tankless. I am told it is best to install a commercial tankless to do this job (which I am fine with). Apart from that, does anyone have any thoughts/concerns about making this transition? As you can probably tell, I'm an HVAC neophyte.

    Thanks kindly for all responses.
    My understanding of tankless is that while they may output 180 degree water they will not give the volume of water at that temp to satisfy the air handlers.

  8. #8
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295

    Question

    Quote Originally Posted by swarwick View Post
    I am thinking of installing an air handler instead of a new furnace, and having the air handler warm the air with hot water from my tankless.

    Apart from that, does anyone have any thoughts/concerns about making this transition?
    Tankless is not a realistic, economical option.
    You will likely need a new electric panel to handle 50 - 100 Amps.

    Heat pump with back-up electric strips is the normal equipment used in many parts of the U.S.

    Dual fuel with gas furnace may also be an option.

    Look up your local utility (gas & electric) rates.
    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

  9. #9
    Thanks to everyone for taking time to respond.

    I think I could have been clearer in my post. My tankless water heater will be gas (I live in southern Canada) and if I go with the air handler option, my contractor has advised me to use a commerical tankless, so that there is sufficient volume of water (at, I believe, 180 degrees) to run the furnace.

    I appreciate that the tankless heater may or may not be more economical than a tanked version in the long run, but I have decided to go that route. My only question is whether I should tie a new furnace into my tankless. I just don't know enough about furnaces (other than the standard gas models) to decide what to do.

    Thanks again for everyone's time.

  10. #10
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295

    Thumbs down Thoughts on The Thankless Tankless

    Quote Originally Posted by swarwick View Post
    My tankless water heater will be gas
    (I live in southern Canada) and if I go with the air handler option, my contractor has advised me to use a commerical tankless, so that there is sufficient volume of water (at, I believe, 180 degrees) to run the furnace.

    I just don't know enough about furnaces (other than the standard gas models) to decide what to do.
    IF it is a True-Tankless how does one have ANY volume of water,
    let alone a sufficient volume.

    The semantics of (terms used in) this thread seem to defy logic.

    I believe that a Gas fired True-Tankless water heater
    would more commonly be known as Boiler
    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

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