Well, it's not quite that simple.
She wants one that will do a sink AND a shower. I highly doubt an under counter unit will do a shower, and a larger one will definitely need a much larger electrical circuit(s) or a larger gas line run.
It's great to try and simplify things for a DIYer, but sometimes over-simplifying things can lead to bad things happening and wasted time and money.
--- In DoIt_Yourself@yahoogroups.com, "J. D. Brown" <jdb8251@...> wrote:
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> Howdy Miss Kathy,
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> It would not be very hard at all, provided you or someone you know have the tools and the knowledge to do the connections for the piping and wiring for the electrical hook-up on the under counter unit. The hardest problem maybe the location of your load center and having an open slot for a 20 amp circuit breaker to supply the needed current carring capacity.
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> Another need to be thought about is running the 12/2 w/ground wire from the load center to the under sink water heating unit. You way want to run this wire through the addict or under the house or around the house. It will depend on what way will serve you the best and what will be the easiest to route  this wire and safely protect it from any damage from any source.
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> The wall receptacle under the cabinet maybe recessed into the wall or surfaced mounted, whatever floats your boat. One of the major problems with the routing is if you do go through the addict is being able to drill into the addict header over the load center and the wall where the sink and water heater will be located. The problem is if on either location if the wall is an outside wall it will be tough to drill these holes to get the wire down to the load center and to the water heater unit, as the spacing between the roof and the headers is going to be very close together. It can be done with the proper drill and drill bit for this type of close spacing. However, if either or both of these locations are on inside walls it will be very easy.
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> This is about my 6&7/8's on your question Miss Kathy. Hope it can serve some use to you in your Do-It-Yourself project ma'am.
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> AGAPE,
> jdb, txredneck
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> Forwarded Message ----- From: kathycofer <kathycofer@...>
> To: DoIt_Yourself@yahoogroups.com
> Sent: Saturday, August 24, 2013 4:04 PM
> Subject: [DIY] Water heater
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> Hi All! I have a 40 gallon gas water heater that died. I need to replace it. It only services one bathroom sink and a shower used once daily. I have another one for the rest of the house working fine.How hard of feasible would it be to replace with an "on demand" water heater? Thanks in advance, Kathy
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