DIY Home Improvement Forum banner

1 - 14 of 14 Posts

·
Registered
Joined
·
20 Posts
Discussion Starter · #1 ·
Not able to find much anywhere via Google or this forum.

Considering installing a tankless, our water heater is leaking and I would really love to reclaim the space.

I have an existing soffit in my garage where theres various things run including electrical, a short run of HVAC, and an exhaust fan and dryer vent.

Can anyone tell me if its OK to add pex into this environment or should I keep it seperate?
 

·
Plumber & Gasfitter
Joined
·
128 Posts
Going tankless shouldn't require redoing any waterlines outside the mechanical room, are you sure you aren't referring to the 636 PVC intake & exhaust piping for a on-demand water system?

If you DO mean pex, a garage is generally an unconditioned space and the water line will be susceptible to freezing if your climate allows it. Aside from that, pex is often found side by side will all the other mechanical runs you mentioned.
 

·
Registered
Joined
·
37,305 Posts
Going back and adding your location to your profile would lessen the questions we have to keep asking.
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #4 ·
Thanks, updated the location.

Freezing should not be a problem inside. We do have the occasional dip into freezing temps but it's not a huge concern.

I live in a 2 story house, the current hot water heater does not allow for proper venting since the flue is galvanized and goes up to the roof. The only exterior wall it shares is the entry way. Besides being impossible to get to it would be very cost prohibitive to do all the stainless required.

40' of PEX would allow me to re-route the plumbing an an exterior wall close to the gas meter that already has an available T and the electrical panel. This would allow me to install an external unit.

If need be I can create another small soffit just for the water lines, or just leave them exposed, but I would prefer to have it look cleaner than that.
 

·
Doing it myself
Joined
·
3,838 Posts
Keep in mind, adding another 40 feet of hot water line to the system = larger cold water sandwich.
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #6 ·
Are there other options?

Unless I can vent out the existing vent it will have to be moved. Minimum is 20ish feet, but then the gas would have to be routed over the man door.

So, its either the gas/110 or the water.
 

·
Doing it myself
Joined
·
3,838 Posts
Hard to say without knowing what the water lines are doing. If the hot line is travelling somewhere near where your heater is going to be, the best is to tap into the existing line at it's closest point rather than extending the hot water outlet line.

If you don't have that option, then it doesn't hurt anything, it's just annoying.
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #9 ·
Thanks for the input, there's really no closer solution unless I get to a point where I start taking all the siding down. The house is pretty much maximized for the space. Not much of any attic, on a slab, and nearly every wall is utilized on both sides. It was very well thought out.
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #10 ·
Just a thought, if I got a condensing unit that used PVC. What are the chances of me swapping out the flue from only the garage and roof with a floor in between?

Then I would only have to worry that my gas supply might be too small (3/4 OD black pipe) and electrical which I am not concerned about.

I assume they are strapped in place fairly well.
 

·
Doing it myself
Joined
·
3,838 Posts
You're talking about leaving a ~ 10Ft section of (galvanized?) flue pipe inbetween where you can't access it?
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #12 ·
No, wondering if you are would be able to extract and replace it in the section by pulling it out from the attic and garage.
 

·
Doing it myself
Joined
·
3,838 Posts
Ah I see. Hard to say without looking at it. I'd say pulling the flashing off the roof and taking it out that way would be the easiest. The hard part is (if it's in a wall cavity) getting it back in through the insulation.
 

·
Registered
Joined
·
20 Posts
Discussion Starter · #14 ·
It's all interior space, it goes up the middle of my house. There's probably only insulation at the garage and then again in the attic.

I still do not believe my current gas line would be able to handle the demand though.
 
1 - 14 of 14 Posts
Top