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canucksailorguy 05-15-2012 02:38 PM

Charley Noble, tankless water heater vent
Hello all - I'm about to install a tankless water heater (on demand LPG), vented through the cabin roof. Any ideas on where to find a Charley Noble (none on ebay!), or will I have to design and make one? Also, what pvc or plastic type materials will work here, or am I stuck with stainless?
Thanks, look forward to a helping of the wisdom here.

s/v Gypsy Wind
lying Annapolis, MD

misfits 05-15-2012 02:59 PM

Re: Charley Noble, tankless water heater vent

Consult your installation/owners manual for type of material the vent piping & termination
kit/assembly needs to be. Being up in Canada the material may be a different standard than what would be used in the lower 48 so be careful where the advice comes from. You guys are on the CGA standard.


canucksailorguy 05-15-2012 03:06 PM

Re: Charley Noble, tankless water heater vent
Good thoughts - although I'm here in the US now, and there are no 'approved' standards for a boat install. Couple of thoughts - the company says a standard flexible dryer pipe works, then I was thinking a cap such as Home Depot sells (3 in. Vertical Cap-3080 at The Home Depot).
Comments anyone?

deniseO30 05-15-2012 09:06 PM

Re: Charley Noble, tankless water heater vent
what make and type of tankless you using? power vented? most if not all vent terminations will let water in and down the pipe not good for most tankless units.

canucksailorguy 05-15-2012 09:53 PM

Re: Charley Noble, tankless water heater vent
I'm seeing this will be a problem. The unit is an EZ Tankless 101 - it's a flue type. I think I may have to have a cap for when it's in use, and a way to seal the pipe off when it's not in use and/or I'm underway. Not insuperable, but not as easy as I'd first thought.

deniseO30 05-15-2012 10:19 PM

Re: Charley Noble, tankless water heater vent
I'd suggest you use the pipe listed on their site. Most types of natural draft gas units need a tee to vent to first. That way water won't enter the unit but will drop down in the tee. You won't be able to use pvc to vent it. the exhaust temp will be too high because the ez 101 is NOT a condensing type gas unit it's afue rating would be low. Also there are no afue ratings on the site.

I don't like this statement in the "green" section of the site.

EZ Tankless on demand water heaters are very competitively priced. When bringing our products to market we knew that we had a green product, but knew that most people would not be prepared to purchase an environmentally and energy efficient product if it was several times more expensive than the existing technology. We knew that the cost of a replacement storage tank water heater is generally between $400 and $700. Part of our business plan was to bring to market a product which sold at around these prices. Naturally we did not want a product built to a price point, so we built the highest quality product we could, using the highest quality materials, and did other things to keep our prices low.(i.e. refusal of Energy Star Label, No Dealers, etc…)

canucksailorguy 05-15-2012 10:37 PM

Re: Charley Noble, tankless water heater vent
I was thinking of using that pipe (or suitable sized flexible stainless pipe) to the hole where the vent would exit to the outside, and the cap over that. Set up the pipe so that it can be put to the side when the unit is not in use (when not showering, dishwashing) and have a cap that will prevent water from coming in.
The factory told me it was possible to use the same type of flexible plastic 'hose' used for dryers. Apparently, there's not a lot of heat here. That may be the easiest solution. I may fire the unit up and see just how much heat actually is produced before installing.
Not sure what it is in that green statement you don't like. Seems like a business plan that is geared towards providing a low cost but high quality product. As noted, things like Energy Star or a dealer network cost money.

deniseO30 05-15-2012 11:16 PM

Re: Charley Noble, tankless water heater vent
natural draft is about 70 -80% afue. Natural draft is also way cheaper to manufacture. Energy star rates are over 90% afue and extract so much heat from the burned gas they need a condensation drain. but of course home owners are into the numbers. We installed (I'm in the business) a dual purpose on demand in my house in Dec. cut the hot water and heating costs by 60% from the oil fired boiler I had installed when I bought the house.

mitiempo 05-16-2012 12:15 AM

Re: Charley Noble, tankless water heater vent
Use the same type of Charley Noble you would with a bulkhead mounted propane heater or a diesel fired heater. You can find marine quality stacks and deck fittings here - Propane Fireplaces

I can't see any type of plastic working - melting, but not working. I have owned tankless propane water heaters in the past and liked the convenience.

If you are surveyed for insurance they will probably ask for its removal as it doesn't meet ABYC standards. Insurance companies hate them. The standards call for a vent, no open pilot light, AND a closed combustion chamber. The only one I know of that can meet the standards is the Precision Temp but it is a lot more expensive.

canucksailorguy 05-16-2012 10:55 AM

Re: Charley Noble, tankless water heater vent
This is all great stuff, and thanks! Interestingly enough, the guy at the factory tells me I can use a clothes dryer vent and flex piping for this - I'm going to hook it up with a hose, outside, and see just what kind of heat comes out the flue.
Denise, what is afue? You keep mentioning it.
Brian, thanks for the Dickinson Marine ref - also, Victoria Harbour - would that be the one in Ontario, in Georgian Bay?

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