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Tankless water heater for a car wash?

hr Member Posts: 6,106
be able to get a gpm and temperature spec from the equipment suppliers? If it is just a garden hose connection I would say 120° of less would be fine for washing.

The last two automatics I have worked on were cold water wash and rinse. The hot water is just used to mix the soaps and waxes in small float tanks with injection mixing into the bay. As such the DHW load was fairly small.

Determine what is needed and you should be able to get an instantanous to do the job. They offer some very large commercial sizes these days.

Make sure you plug in the coldest expected incoming temperature when you size them!

hot rod

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  • Chuck_7
    Chuck_7 Member Posts: 71

    Not a commercial car wash, but a wash bay at a new car dealership. Would a tankless water heater like a Rinnai work out well? Is there a product that would work better in this environment?
  • jeff_51
    jeff_51 Member Posts: 545
    You may need a couple in series

    At the dealerships I've worked at, they really crank the cars through. If it is a smaller place, you may get away with just one. You can always go back and add another if needed. I would think it would save them money either way.
  • hr
    hr Member Posts: 6,106
    That has become

    a common way to provide carwash DHW. I've been involved in three new carwash jobs in the past couple years. All had Palomas specd as the DHW source.

    We switched two to Clean Burn waste oil as they were connected to Jiffy Lube oil change shops.

    One is a hand wash facility, that just got with 3 Paloma's on the wall.

    It sure does free up a lot of precious floor space over the large copper boilers and large insulated storage tanks that are common in most older wash facilities.

    hot rod

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  • Chuck_7
    Chuck_7 Member Posts: 71

    Thanks for the feed back. This particular dealarship has a pull through bay with room for two cars side-by-side. I figured they would have one hose per side. I was trying to decide if one 180MBH heater could handle both. I would think that they are not looking for 120deg water. Right now I am going with two though.
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