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(AS12_AQ3ES) AQ3ES Vent Kit for Bosch AquaStar 2700ES / 2400ES
The AQ3ES Vent Kit transforms the Bosch AquaStar 2700ES / Bosch AquaStar 2400ES into a direct vent, room-sealed combustion tankless hot water heater.
The Bosch AquaStar 2700ES / Bosch AquaStar 2400ES tankless water heaters can obtain combustion air from outside the home (recommended) or potentially from ambient air inside the home (depending on your available air volume).
It is recommended to use the AQ3ES Vent Kit to pipe the combustion air from outside the home as this is less expensive air (non-conditioned) and outdoor air is generally cleaner air, allowing for less maintenance on the water heater and for a longer life expectancy of the Bosch AquaStar 2700ES / Bosch AquaStar 2400ES.
Check your heater's Installation Manual to determine if you have enough available air volume inside to properly supply its air intake needs.
If you will be terminating the vent pipe from the Bosch AquaStar 2700ES / Bosch AquaStar 2400ES horizontally out a sidewall, the AQ3ES Vent Kit is required.
You may use PVC or rigid sealed 3” or 4" pipe for the combustion air. Please read the heater's Installation Manual for the full details.
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