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Old 09-17-2009, 09:48 AM   #1 (permalink)
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Enclosing tankless water heater?

Got a call yesterday,
someone wanting me to do some remodeling at their house,

Their laundry room also has a gas water heater in it, and a closet across one end, that backs up to a storage room, the storage room is accessed by a door in the carport.
CLoset is standard depth, plenty wide enough but not deep enough for w&D
got it?

They want the closet across the end expanded into the outside storage room, to make it deep enough to house the W&D,
doable but a lot of work.

They also want the water heater replaced with a tankless, and I was thinking of suggesting it be installed on the wall where the existing gas one is, but they want it covered with some kind of cabinet or something, since you can see it from the kitchen if the laundry room door is open, which it almost always is.

Can a tankless be covered with some kind of ventilated cabinet?
Like say a regular kitchen cabinet with screen wire on the top & bottom?

If not I will suggest to them that the water heater be moved into their crawlspace which is plenty tall enough, and even looked to have a metal flue from a furnace that got replaced with a high efficient unit and pvc plastic flue in another location.


Suggestions?

Bueller?
Bueller?



Bueller?
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Last edited by roundhouse; 09-17-2009 at 09:51 AM.
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Old 09-17-2009, 09:52 AM   #2 (permalink)
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Pretty sure the plastic flue on a tankless water heater is a no-go.
As for enclosed in a cabinet, I'm pretty sure that's OK as long as it's ventilated enough to get combustion air in, and any combustible materials are far enough from the flue to be safe.
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Old 09-17-2009, 09:54 AM   #3 (permalink)
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You should be fine enclosing it, and the ventilation is always a good idea.

But you need to check the manufactures specs on the particular unit you are planning on installing for requires clearances and enclosure precautions, if any.
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Old 09-17-2009, 10:22 AM   #4 (permalink)
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Call Rheem and ask them their clearance specs. IIRC to install it per-their instructions you need some clearance around the entire unit.

And you are def. gonna need to ventilate it if they are using a gas one. Mine is in a small laundry room, and I open the door up to the house if anyone is taking a shower or if I`m doing laundry all day, mine side-vents and it puts out some air flow.
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Old 09-17-2009, 10:24 AM   #5 (permalink)
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Quote:
Originally Posted by Scott@Rockstomper View Post
Pretty sure the plastic flue on a tankless water heater is a no-go.
As for enclosed in a cabinet, I'm pretty sure that's OK as long as it's ventilated enough to get combustion air in, and any combustible materials are far enough from the flue to be safe.

The abandoned flue in the crawlspace is a metal one.
There is a good spot in the laundry room to mount the tankless on an exterior wall and and use the hole thru the side of the house for the flue from the tankless. The tankless has a 2 way flue right?
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Old 09-17-2009, 07:17 PM   #6 (permalink)
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Another quick Q:
Need to extend the power wire for the dryer.
Is it within code to put in a J-box and add 12 feet to the wire,or do I have to install a new home run?
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Old 09-17-2009, 08:26 PM   #7 (permalink)
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Mine requires a fair amount of ventilation and if I remember right it's for freeze protection. You don't want a back draft through the exhaust. That said, it also said you could bring the fresh air from the outside as well.

Quote:
Originally Posted by Scott@Rockstomper View Post
Pretty sure the plastic flue on a tankless water heater is a no-go.
Depends on the brand. I have a new Navien unit. A PVC flue is fine with it because the efficiency is ridiculous. The exhaust is luke warm at best.

Quote:
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The tankless has a 2 way flue right?
Mine has an inlet and exhaust. Sounds like you're going to have to pick a brand and roll with it.
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Old 09-18-2009, 05:28 AM   #8 (permalink)
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Some of the heaters will require category 3 piping which is stainless steel. This flue pipe is not cheap, but the flue piping can be minimized by venting out horizontally.
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Old 09-18-2009, 12:45 PM   #9 (permalink)
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Is there a site that shows the differences in the brands of heaters??
& rates the heaters.

Or do I have have to search each manufacturers site for info.?
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Old 09-18-2009, 12:54 PM   #10 (permalink)
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There have been a couple threads here that brought good info.

Ours is exterior mounted but you have to watch out for freezing. It could have been mounted inside with a vent kit (sold seperately) There were pretty specific specs for lenght of pipe and draft IIRC
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Old 09-18-2009, 02:05 PM   #11 (permalink)
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Quote:
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There have been a couple threads here that brought good info.

Ours is exterior mounted but you have to watch out for freezing. It could have been mounted inside with a vent kit (sold seperately) There were pretty specific specs for lenght of pipe and draft IIRC

Outside mount is not desired, they do a lot of entertaining in the back yard patio and dont want it visible on the outside.
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