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  1. #1
    Join Date
    Apr 2012
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    Missouri
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    Question Tankless Hot Water Heaters

    I am building a new home aprox 2000 square feet with 2 full bathrooms, Laundry, and a kitchen that will be needing hot water supplied to them i have used a normal 210 hot water heater in the past but have always seen tankless hot water heaters be used on this old house we tend to use a lot of hot water when showering and always run out before we are all done taking showers. Was wondering if a electric tankless hot water heater would be the way to go or if it would be able to keep up never used one or been around them to know how efficient they are. Cost to run compared to a normal hot water heater.

  2. #2
    Join Date
    Jul 2010
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    SoCal
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    Default Re: Tankless Hot Water Heaters

    Heavily used electric tankless water heater will take you to the cleaners, and I mean the cost.

    Do you have access to gas?

  3. #3
    Join Date
    Apr 2012
    Location
    Missouri
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    4

    Default Re: Tankless Hot Water Heaters

    no natural gas avaliable and propane out here in the country where i live is outragious. That is what i figured though that is why i was wondering if a tanked hot water heater would be better off

  4. #4
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    SoCal
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    Default Re: Tankless Hot Water Heaters

    I would stay away from tankless, for their inconsistency in delivering hot water at all times, initial costs of installation and high maintenance costs.

  5. #5
    Join Date
    Apr 2012
    Location
    Missouri
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    Default Re: Tankless Hot Water Heaters

    Will do Thank you for your help

  6. #6
    Join Date
    Aug 2007
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    The Great White North
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    Default Re: Tankless Hot Water Heaters

    The operating cost will be no more than a tank electric heater and will likely net a 10 -15 % reduction in utility costs ( possibly more ). Remember you are only using electricity to heat the water when there is a demand and not to maintain the temperature of the standing water in a tank type.

    However, a major consideration will depend on where you live and the incoming water temps during winter months. The colder the incoming water temperature the lower the gpm output. Which might require a larger unit to accomodate heavy use during those times --- this will require having a large enough electrical service .
    "" an ounce of perception -- a pound of obscure "
    - Rush

  7. #7
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    Aug 2007
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    Default Re: Tankless Hot Water Heaters

    Quote Originally Posted by dj1 View Post
    I would stay away from tankless, for their inconsistency in delivering hot water at all times, initial costs of installation and high maintenance costs.
    Electric units don't have much of a high installation cost and very little maintenance compared to gas or propane units.
    As to inconsistant hotwater delivery -- most issues are usually a result of not having the correct size unit.
    Much of the bad rap are from gas units and poor installations ( many DIY ) --- not sizing the unit correctly --- not having the correct volume of gas supply.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  8. #8
    Join Date
    Feb 2008
    Posts
    179

    Default Re: Tankless Hot Water Heaters

    TBruegman:

    If nat gas isn't available & propane is too high, what will you be using for a heating system??? If you by chance will be using forced hot water with an oil-fired boiler you have the excellent option of installing as part of this setup a 40 gallon indirect hot water heater, which will go far to insure you have adequate hot water for showers, clothes washing, etc.

    You will need to have forced hot water heating, the rest is a piece of cake.

  9. #9
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,418

    Default Re: Tankless Hot Water Heaters

    If your goal is to go "green", then an electric tankless water heater is NOT the answer. It may save you a little money, but at the coast to the rest of us.

    Your electricity is metered on the secondary side of the transformer. That means that you are not paying for the losses of the transformer. Transformers have two types of losses called no-load and load. When you add a load the size of an on demand electric water heater, it will easily overload a typical residential transformer. When you overload the transformers, the load losses increase exponentially. That means the losses increase faster than the load. For example, an overload of 150% will increase the load losses by over 200%. This type of water heater will overload a typical residential transformer by 150 - 200% all by itself.

    In addition to the transformer load losses increasing, the output voltage goes down. When this type of water heater is running, you could experience a brown out condition in your home. I have heard of complaints from owners about the line voltage in their house drops as low as 90 volts.

    Now if your utility replaces the regular transformer with a larger one, then the no load losses increase and the voltage drop decreases. The no load losses are pretty constant whether the transformer is idle or loaded. A typical residential transformer uses about 25 watts 24/7. If they have to put an oversized transformer on the pole (or pad), then the utility is losing about 50 watts 24/7.

    Todays electric tank water heaters are so well insulated that the heat losses are very minimal. In most cases it will be about a buck a month or less. If you want to go green, consider a solar hot water panel to augment the heater, but make sure that you can use the solar panel economically. Even with it, you have the cost of running the pump.

  10. #10
    Join Date
    Aug 2007
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    The Great White North
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    Default Re: Tankless Hot Water Heaters

    Quote Originally Posted by keith3267 View Post
    If your goal is to go "green", then an electric tankless water heater is NOT the answer. It may save you a little money, but at the coast to the rest of us.

    Your electricity is metered on the secondary side of the transformer. That means that you are not paying for the losses of the transformer. Transformers have two types of losses called no-load and load. When you add a load the size of an on demand electric water heater, it will easily overload a typical residential transformer. When you overload the transformers, the load losses increase exponentially. That means the losses increase faster than the load. For example, an overload of 150% will increase the load losses by over 200%. This type of water heater will overload a typical residential transformer by 150 - 200% all by itself.

    In addition to the transformer load losses increasing, the output voltage goes down. When this type of water heater is running, you could experience a brown out condition in your home. I have heard of complaints from owners about the line voltage in their house drops as low as 90 volts.

    Now if your utility replaces the regular transformer with a larger one, then the no load losses increase and the voltage drop decreases. The no load losses are pretty constant whether the transformer is idle or loaded. A typical residential transformer uses about 25 watts 24/7. If they have to put an oversized transformer on the pole (or pad), then the utility is losing about 50 watts 24/7.

    Todays electric tank water heaters are so well insulated that the heat losses are very minimal. In most cases it will be about a buck a month or less. If you want to go green, consider a solar hot water panel to augment the heater, but make sure that you can use the solar panel economically. Even with it, you have the cost of running the pump.
    Curious -- the water heater is a 240 volt appliance as is your electric clothes dryer , range , air conditioner , heat pumps , etc.
    I'm trying to understand how the demand water heater will create the issues you mentioned ?
    There may be a need to have a 200 amp service to your home but that's not uncommon these days.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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