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Old 08-20-2016, 07:49 AM   #1
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What size water heater?


I think the water heater at the cottage is leaking. It appears to have a drip. I want to replace it. The main issue I have is the new unit must be 120 volts 1500 watts, same as the old one. There is no room electrically to add a 240 circuit. All the 120 volt units I have found locally are only 10 gallons. The old one is 40 gallons.
Is 10 gallons enough to use for a shower? Does anyone have a small unit like this on a shower? Is it giving enough water?
What would be the minimum size I should consider?
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Old 08-20-2016, 09:09 AM   #2
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Re: What size water heater?


I suspect you are mistaken about the voltage of your present water heater. Check the breaker, is it a single breaker or is it a double breaker?
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Old 08-20-2016, 09:59 AM   #3
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Re: What size water heater?


Here's a 20 gallon
http://www.homedepot.com/p/Rheem-Per...20U0/204318374

Buy a 40 gallon 240 tank and replace the elements.
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Old 08-20-2016, 09:59 AM   #4
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Re: What size water heater?


Not mistaken. Absolutely certain it is 120 volts 1500 watts. The only double pole is the stove. Breaker #2, single pole 15 amp, turns off the heater.
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Old 08-20-2016, 01:15 PM   #5
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Re: What size water heater?


http://www.sears.com/rheem-richmond-...&blockType=G14

A 15 gallon one take short showers.
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Old 08-20-2016, 01:24 PM   #6
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Re: What size water heater?


Quote:
Originally Posted by joed View Post
Not mistaken. Absolutely certain it is 120 volts 1500 watts. The only double pole is the stove. Breaker #2, single pole 15 amp, turns off the heater.
I am sure that service is large enough for an electric tankless.

NOT!
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Old 08-20-2016, 01:35 PM   #7
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Re: What size water heater?


Here is a 40 gallon 120 volt, 3000 watt.

Needs a 30 amp breaker and #10 wiring.

http://www.hotwater.com/water-heater...mhe6-40r-030d/
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Old 08-20-2016, 02:53 PM   #8
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Re: What size water heater?


Quote:
Originally Posted by rjniles View Post
I am sure that service is large enough for an electric tankless.

NOT!
It is not big enough for a tankless. I am not looking for a tankless.
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Old 08-20-2016, 02:55 PM   #9
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Re: What size water heater?


Quote:
Originally Posted by rjniles View Post
Here is a 40 gallon 120 volt, 3000 watt.

Needs a 30 amp breaker and #10 wiring.

http://www.hotwater.com/water-heater...mhe6-40r-030d/
That could work. I would need to pull new cable but I could do that. However, I don't think I need a 40 gallon. There is no laundry or tub here. It is only a shower, a bathroom sink and a kitchen sink.
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Old 08-20-2016, 03:07 PM   #10
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Re: What size water heater?


Quote:
I would need to pull new cable but I could do that
If you can do that, check to see if "slim line, tangent,two-in-one" or what ever you want to call them, breakers are available for your panel. If so combine two other circuits so that you have two spaces available for water heater. Then install a double breaker and 10-2 to water heater so you can use the more prevalent 240V heater of the size you would like.
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Old 08-20-2016, 03:08 PM   #11
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Re: What size water heater?


Quote:
Originally Posted by joed View Post
That could work. I would need to pull new cable but I could do that. However, I don't think I need a 40 gallon. There is no laundry or tub here. It is only a shower, a bathroom sink and a kitchen sink.
You asked for a 40. In post #3 I gave you a link for a 30. That one needs a20 amp breaker on #12 wire.
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Old 08-20-2016, 06:30 PM   #12
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Re: What size water heater?


I don't particularly want a 40. That's what was here when I bought the place. I don't think I need that large but I don't want too small. A 30 or a 25 is probably big enough.
That unit is not listed in CANADA. HD Canada has a 23 gallon unit that would probably work but it is 240 volts.

Last edited by joed; 08-20-2016 at 06:35 PM.
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Old 08-20-2016, 06:37 PM   #13
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Re: What size water heater?


Quote:
Originally Posted by joed View Post
I don't particularly want a 40. That's what was here when I bought the place. I don't think I need that large but I don't want too small. A 30 or a 25 is probably big enough.
That unit is not listed in CANADA. HD Canada has a 23 gallon unit that would probably work but it is 240 volts.
I don't know what your code says about sizing heaters but mine is based on the # of bedrooms and bathrooms and the 1 hr. recovery rate of the heater
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Old 08-20-2016, 06:39 PM   #14
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Re: What size water heater?


Have not even considered code. This is a summer cottage used from mid May to Oct. Most of my neighbours don't even have hot water. Heater will drained the rest of the year. Just don't want to run out while taking a shower.

Originally I thought I was stuck with a 15 amp circuit but I have since decided I can change the cable and go to a 20 or 30 amp circuit if I need to but I still need 120 volts.

Last edited by joed; 08-20-2016 at 07:01 PM.
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Old 08-20-2016, 09:19 PM   #15
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Re: What size water heater?


I got poking around some Google sites and the attached is the biggest one I could find. I don't know what capacity is needed but, like you, the main goal is to not have it run out - otherwise we'd shower in the lake. You could also go with a low flow shower head but I hate those things. Seems the only other option would be to buy a 240v heater and install 120v elements but I don't know if that impacts any other electrical components.

http://highway-to-buy.myshopify.com/...w-water-heater

As far as I know, outside structure and waste disposal, the Ontario building code for seasonal residences are pretty loose.
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