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Old 02-16-2012, 12:40 PM   #1
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Tankless hot water heater wiring


Can the same double pole 20 amp breaker for our old hot water tank be used to wire a tankless water heater. We live in a mobile home with a 100 amp service.

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Old 02-16-2012, 01:00 PM   #2
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Tankless hot water heater wiring


If it's an electric tankless, not a chance. They use a LOT of power, maybe even more than your service is rated for. If it's a gas tankless, the only electricity needed is for the control circuitry. Mine is 110VAC and has a regular three-prong plug.

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Old 02-16-2012, 01:04 PM   #3
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Tankless hot water heater wiring


What amperage is the tankless water heater?
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Old 02-16-2012, 01:50 PM   #4
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Tankless hot water heater wiring


We had to updae our homes electric service for our tankless water heater. 120amp draw at full usage. Hopefully live in the south and have a really small unit or it's gas.
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Old 02-16-2012, 03:18 PM   #5
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Tankless hot water heater wiring


Quote:
Originally Posted by rbaker80 View Post
Can the same double pole 20 amp breaker for our old hot water tank be used to wire a tankless water heater. We live in a mobile home with a 100 amp service.
Tankless electric water heater require a lot of power and I don't think your 100 amp panel can support it. I looked at tankless whole house units on Home Depot and the manufactures recommends a 200 amp panel because the unit needs 80 amps.
Do you have LP or natural gas to your house? You may want to look into those are just replace you water heater with a similar unit.
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Old 02-16-2012, 04:49 PM   #6
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Tankless hot water heater wiring


Another idea would be to use two Point of Use heaters like:
http://www.lowes.com/pd_27000-1136-GL6_4294859100_4294937087_?productId=3256918&Ns=p_ product_prd_lis_ord_nbr|0||p_product_qty_sales_dol lar|1&pl=1&currentURL=%2Fpl_Point%2Bof%2BUse%2BWat er%2BHeaters_4294859100_4294937087_%3FNs%3Dp_produ ct_prd_lis_ord_nbr|0||p_product_qty_sales_dollar|1 &facetInfo=
Use one in the kitchen and one for the bath which may support the laundry but not at the same time for long.
You could change the breaker to two 120v 20 amp breakers to power them.

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