You are not limited to installing vents fortankless water heatersthrough the roof. If the interior space allows it, you can use a power vent to draw combustion air from the free space. However, if you must install a direct vent unit due to space limitations or other reasons, you can vent...
A vent apparatus is used to install a tankless water heater or similar equipment inside an attic without going onto the roof. The vent apparatus may include a main housing and an umbrella assembly movably disposed therein. The main housing (e.g., PVC pipe) is installed through the roof. ...
Years ago we started installing gas boilers that allowed venting through PVC Drain Waste Venting (DWV) piping. The use of PVC DWV piping to vent the boilers made for easy routing of vent pipes and the ability to vent up through the roof much like plumbing vent stacks. Until recently the ...