Venting Tankless Hot Water Heater

John Sheehy · 2005-12-09T22:34:13+00:00

I'm replacing a 40 gallon gas water heater with a tankless version (Aquastar 250sx). As the water heater and furnace are within 5 feet of eachother in my laundry room, I WAS going to just angle the existing vent that is connected to the hot water heater now. It is a 3" galvanized vent. It is connected to the vent which is used by the furnace (which looks like 4"), then the pipe going up into the ceiling and out the roof looks closer to 6". However, now that i get the new heater, it says that it needs stainless venting and can not be vented in common.Now for my question, and i know it sounds stupid, but just wondered what everyone else is doing. Can i just use that vent or atleast that stack that goes up through the roof and change it all to stainless? Or is there any way to do this without running a new exhaust? If there isn't, what is better to do, a horizonal or vertical exhaust? The heater is being mounted on an outside wall so i believe the horizontal wouldn't be that hard, but are there any issues with my siding being vinyl? The previous owner melted some by placing the grill a little too close, i can't imagine that this thing is going to fair any better.Finally, it has the option to use in room combustible air or have a seperate vent run for that, what are the advantages/disadvantages or doing it either way. I live in Central New Jersey if it makes a difference.Thanks in advance for your help.

Dec 09, 2005 21 Replies

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m Ransley 20 years ago

What BS Ive had No maintenance issues in 3 years with my bosch 120. I do have a whole house water filter and whole house surge supression and upgraded grounds, its called logic.

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tombrown 20 years ago

Check out the epinions.com site. A lot of people have complained about the high maintenance cost of the Bosch. The fact that you haven't had a breakdown--yet--does not make other people's experiences "BS".

Also, who is going to take lessons in logic from a person who is incompetent on elementary issues of grammar and punctuation, and who thinks that she can generalize from only her own experience?

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