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Old 03-14-2015, 10:51 PM   #1
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Water Heater Sizing


I own a some apartment buildings and I'm adding a laundry machine pair to one of the buildings.

This will mean adding a water heater for the washing machine since no single tennant will be responsible for the cost of the water heat for that machine.

I've installed water heaters before and am comfortable doing this, but usually I just buy the 60 gallon tank types. Would this be a good application for a tankless electric or possilby a much smaller tank model? It will have to be electric because we don't have a house gas meter at that location.
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Old 03-15-2015, 07:21 AM   #2
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How many apartments?

Electric tankless, will probably require a new house service. As one large enough to handle 2 washers at the same time, would be around 120 KW.
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Old 03-15-2015, 08:44 AM   #3
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The cycle times on the washers (2 of them even being started at the same time) would allow the standard electric water heater time enough to recover. I'd go with your standard unit you mentioned. X2 about the electrical needs of a tankless.
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Old 03-15-2015, 09:49 AM   #4
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Promote the merits of cold water washing.

The one in 20 loads that might actually warrant HOT water can get that
by means of pre-soaking by the tenant in their apartment.
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Old 03-15-2015, 11:33 AM   #5
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Front load washers use considerably less water than coventional top loads you might want to think of installing those to allow for a smaller heater.
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Old 03-15-2015, 11:46 AM   #6
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Quote:
Originally Posted by TarheelTerp View Post
Promote the merits of cold water washing.

The one in 20 loads that might actually warrant HOT water can get that
by means of pre-soaking by the tenant in their apartment.
After short while. The tenants would then probably just take all their laundry to a different laundry, instead of using his. Making the money he spent on the room and machines, a waste.
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Old 03-16-2015, 06:02 AM   #7
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There are 6 apartments in the building, mostly single tenants.

There's only one washer and one dryer, so the water required would only be for one.
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Old 03-16-2015, 07:01 AM   #8
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most new washers use a min of water now a days...I would use your standard heater ..maybe do a 40gal..
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