Tankless Hot Water Heater Air Intake

What code would does apply in this case.

Tankless hot water heater air intake.

Power vent units use indoor air for combustion and simply vent the exhaust to the outside. The air intake filter is located inside the tankless water heater. Saves energy compared to traditional furnaces when integrated with rinnai s highly efficient tankless water heaters or boilers that can deliver home. A direct vent water heater uses special coaxial venting that has separate chambers for intake air and exhaust in a single assembled vent piece.

Do i have to run an intake pipe direct to outside would require ripping out ceiling. Because average water supply inlet temperature varies by location the ideal tankless water heater in the south might not work at all in the north. A direct vent water heater draws air for combustion from outside your home rather than inside. Don t worry it s not hard to get to at all but you have to first remove the tankless water heater face plate.

The manufacturer seems to be ok with either approach. However it would seem it would get plenty of combustible air from the room and i would likely never get a negative pressure situation because of the fresh air intake they put when the house was built. Direct vent units pull in air from outside the house so they have two vents for intake and exhaust. 2 on top and 2 on bottom.

Gas tankless water heaters don t have to use indoor air for combustion. The exhaust gases and excess heat produced by your water heater are then vented back outdoors. The rinnai hydronic air handler systems connects seamlessly to select rinnai tankless water heaters to deliver efficient home heating and domestic hot water simultaneously in one complete system. Tankless water heaters can be vented in two ways.

Altitude but not work at all at 12 000 ft. Our furnace boiler intakes indoor air as currently installed so logic tells me i could do the same with the tankless water too.