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Thread: Tankless HW Heater and High Efficiency Washer

  1. #1

    Default Tankless HW Heater and High Efficiency Washer

    My husband and I would like to install a tankless hot water heater in our home, but we are concerned that it may affect our high efficiency washing machine (LG WM2016C). The washing machine takes in water in short spurts, and we're wondering if the tankless hot water heater will not be able to heat water up fast enough.
    Does anyone have any experience with this problem? Any recommendations?
    Julie

  2. #2
    Master Plumber nhmaster's Avatar
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    Quote Originally Posted by purcjn02 View Post
    My husband and I would like to install a tankless hot water heater in our home, but we are concerned that it may affect our high efficiency washing machine (LG WM2016C). The washing machine takes in water in short spurts, and we're wondering if the tankless hot water heater will not be able to heat water up fast enough.
    Does anyone have any experience with this problem? Any recommendations?
    Julie

    Yes it will effect the washer nagativly and the heater as well. Save your money and headaches, put in a high efficiency tank heater.

  3. #3
    DIY Member ChuckS's Avatar
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    Quote Originally Posted by nhmaster View Post
    Yes it will effect the washer nagativly and the heater as well. Save your money and headaches, put in a high efficiency tank heater.
    I agree that a tankless is not optimal for dishwashers and washing machines. We had to install a recirculation loop to heat the water before turning on the machines. The good news is rinse is usually cold water.

    I like our tankless and do see the energy savings but have to admit they are not machine friendly.

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    Master Plumber Redwood's Avatar
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    Where are you located Chuck and what kind of water temperatures do you see over the winter?

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    DIY Member ChuckS's Avatar
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    Quote Originally Posted by Redwood View Post
    Where are you located Chuck and what kind of water temperatures do you see over the winter?
    Denver CO... It can drop below zero but generally in the 20's... (EDITED to ADD: this is outside temp, I have no idea what the cold water temp is but the plumber recommended I get the big tankless in this area because of the cold water temp).

    I should also add, the problem with our tankless is the plumber installed it in the opposite end of the crawl space. Opposite all facets, opposite anything that uses hot water and opposite any logic now that I see how it works. If I had of knew then what I know now...
    Last edited by ChuckS; 03-28-2009 at 10:29 AM.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    You had a PLUMBER install it and he moved it AWAY from the major points of use? Quel fou! The best location for tankless heaters is CLOSE to the usage points, in fact the ability to move them to where the water is needed is really the major selling point for installing them.

  7. #7
    DIY Member ChuckS's Avatar
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    Quote Originally Posted by hj View Post
    You had a PLUMBER install it and he moved it AWAY from the major points of use? Quel fou! The best location for tankless heaters is CLOSE to the usage points, in fact the ability to move them to where the water is needed is really the major selling point for installing them.
    He claims he had to put it where he did because of my natural gas service. There is a 3/4" in gas line running about 20' to the furnace which in the past went about another 7' to the old tank water heater. He said the Tankless needed it's own gas line and it had to be short to supply the 200K BTU my unit maxes at. So he ran a new gas line from the meter which is about 5' in length, however, the water lines are a good 35' of 3/4 pipe... So now I am trying to invent the optimum recirculation loop to reduce the time it takes to get hot water. I am not savvy enough to move the heater and can't afford another plumber.

    So I guess I should say to the OP, a tankless might work great for your washer if the distance from the heater to the washer is short. In my case, I have a Paloma 7.4 Series tankless heater which takes approx 6 seconds from the time you turn on a facet before it is kicking out hot water. Then you have to consider the flow rate multiplied by the distance from the heater to the washer to get an idea of how much cold water has to be purged from the pipes before you get any hot water.

    It may work well if you can get the tankless heater within a few feet of the machine.

  8. #8

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    Hi,
    I'm in Wisconsin & have an electric t/l water heater!
    We buy tide cold water soap!
    Wash everything with cold water & works great!

    If we do need hot water, well then just run hot water for a bit to get all the hot water lines nice & hot. We never have a problem doing this either when needed.

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    Master Plumber Redwood's Avatar
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    Quote Originally Posted by jbbcd View Post
    Hi,
    I'm in Wisconsin & have an electric t/l water heater!
    We buy tide cold water soap!
    Wash everything with cold water & works great!

    If we do need hot water, well then just run hot water for a bit to get all the hot water lines nice & hot. We never have a problem doing this either when needed.
    How many days does it take to fill the bathtub?

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