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Replace Roof Vent With Horizontal Option - Water Heater

 
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Old 04-06-2020, 09:04 PM   #1
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Replace Roof Vent With Horizontal Option - Water Heater


While I am not a plumber by trade, replacing water and gas lines are not a big deal to me as I have to move spigots and grill gas lines all the time. Venting is not so common as everything is usually already outdoors.

I am looking to replace a standard indoor 75 gal water heater for a client so they can add an outdoor shower. They would like to vent it horizontally out the side of the house (basement wall) rather than the roof. Since their furnace was upgraded to a 96%, the roof vent is only supporting the water heater now. They are looking to eventually get rid of this stack all together to free up space in a second floor bedroom closet and first floor study.

I was looking to use something like their furnace has, but unsure if that will work for a water heater. They do not want to have a snorkel setup on the outside of their house as the exit point would be above the 12" minimum distance from the ground.
https://media.diversitech.com/web_image/HVENT-3.jpg?


Would something like this work?
https://www.homedepot.com/p/Noritz-P...T-HL/300311527

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Old 04-06-2020, 10:29 PM   #2
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Re: Replace Roof Vent With Horizontal Option - Water Heater


I believe to do what you are thinking would require a power vent heater.

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Old 04-06-2020, 10:31 PM   #3
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Re: Replace Roof Vent With Horizontal Option - Water Heater


Power vent water heater means no power, no hot water. I’d stick with what they have.
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Old 04-06-2020, 10:36 PM   #4
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Re: Replace Roof Vent With Horizontal Option - Water Heater


Quote:
Originally Posted by Big Johnson View Post
Power vent water heater means no power, no hot water. Id stick with what they have.
I agree , leave it like it is. Trying to put a outside vent on like that on a normal heater is asking for problems.
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Old 04-06-2020, 10:49 PM   #5
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Re: Replace Roof Vent With Horizontal Option - Water Heater


On new houses I use power vented WH’s because even with its added cost it’s cheaper than running new type B venting out the roof.

In the old days when you had to vent the furnace out the roof it was only a few more bucks to connect the wh to the vent.
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Old 04-07-2020, 08:45 AM   #6
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Re: Replace Roof Vent With Horizontal Option - Water Heater


There are also direct vent water heaters. They need to be installed on an exterior wall.
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Old 04-07-2020, 10:26 AM   #7
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Re: Replace Roof Vent With Horizontal Option - Water Heater


This is from the install/instruction packet for the water heater. I tried to call the local city, and they simply said follow the guidelines from the manufacture, which is a great help...not.


Excerpt from doc:
Combustion and Ventilation Air:
...
If horizontal ducts are used to communicate with the outdoors, each opening must have a minimum net free area of not less than one square inch per 2000 Btuh of the total input rating of all the appliances in the enclosure. If ducts are used, the minimum dimensions of rectangular air ducts shall not be less than 3 in.
NOTICE: If the duct openings which supply combustion and ventilation air are to be covered with a protective screen or grill, the net free area (openings in the material) of the covering material must be used in determining the size of the openings. Protective screening for the openings MUST NOT be smaller than 1/4 in. mesh to prevent clogging by lint or other debris.
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Old 04-07-2020, 10:27 AM   #8
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Re: Replace Roof Vent With Horizontal Option - Water Heater


She is not interested a power vent due to no hot water when they lose power...They have had 1 power outage in the last 20 years, but she is set in her decision.
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Old 04-07-2020, 11:01 AM   #9
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Re: Replace Roof Vent With Horizontal Option - Water Heater


Direct vent needs no power.
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Old 04-07-2020, 11:34 AM   #10
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Re: Replace Roof Vent With Horizontal Option - Water Heater


So I take it what she has is a direct vent WH. Is so, great, but what type of termination do I need once I get the the outside? The above is all that is offered in the documentation. Would one of the items posted originally be sufficient?

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