Best case scenario you kill your furnace.
Can tankless water heater and furnace share vent.
The difference is that a power vent water heater pulls in combustion air from the space around the appliance then uses a fan to propel the exhaust through the vent.
Facts about tankless water heater venting.
However the key here is to install the vent pipe in the size required by the water heater.
You furnace vent pipe is probably type b vent and not suitable for this use.
The furnace in the photos is a category i appliance a negative pressure draft vent appliance.
While there are high efficiency gas water heaters tank less units for one that utilize pvc for vents you will run into trouble trying to get the size correct for both.
Tankless water heaters can vent through the roof or a side wall creating more flexibility and options for placement.
A high e furnace has separate venting which leaves the existing vent pipe to serve only the water heater.
Vent to the outside.
Yes venting tankless water heater with furnace is possible.
The vent pipe must be made of stainless steel designed for venting corrosive gases.
Your tankless requires it s own individual vent.
This unit is a condensing unit and requires a pvc vent so no you can t connect it to the common vent you describe.
Before you decide against a tankless water heater for your next project consider these tankless water heater venting requirements.
Typically they require stainless steel triple wall venting.
Traditional gas tank water heater require venting through the roof.
A direct vent system pulls in.
Tankless heaters put out a lot of heat.
Here are a few things your installer should consider for effective tankless water heater venting.
Tankless water heater venting must be done correctly to ensure safe and efficient operation of the unit.
Gas tankless water heaters don t have to use indoor air for combustion.
Most homes have a shared vent serving both the furnace water heater when the furnace efficiency is up to 80 which is today s standard efficiency gas furnace.
It would be a potential fire hazard.
Worst case scenario you kill your family.
Tankless water heaters can be vented in two ways.
Special stainless steel pipe.
The furnace is likely sized correctly with no room to add another appliance.
The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting.
This is because most homes have water heaters and furnace sharing the same exhaust vent.
