AQ3ES 4TWHVK3SII Bosch AquaStar 3" Horizontal Tankless Vent Kit


Weight: 8.00 lbs

Rush Order:

Kit for venting horizontally through a wall for several different Bosch tankless water heater models. Pipe diameter is the required 3" diameter and is manufactured by Z-Flex.

Compatible models: Bosch Therm 940ES, Bosch Therm 830ES, GWH 715ES, 2700ES, 2400ES, and Evolution 500

For additional, compatible 3" diameter Z-Vent stainless steel vent items, please click the blue Related Gadgets tab on this page.

Made in AmericaComponents

qty. one 3" diameter 1' length pipe
qty. one 3" diameter 1.5' length pipe
qty. one 3" diameter 90 degree elbow
qty. one 3" diameter wall thimble
qty. one 3" diameter termination hood or box
qty. one 3" diameter fresh air intake hood

Your installation may require additional pieces. Please contact us for assistance, or browse the Single Wall Venting catagory here on

Suggested additional venting pieces:

→ Air intake pipe or hose. Options are 3" PVC (commonly available) or 3" aluminum flex pipe.
→ Kit does not include the required 3" diameter Universal Appliance Adapter. Available for purchase separately here.
→ Kit does not include a condensate drain pipe which may be required depending on your water heater manual guidelines and building code.
This is a 3-in-1 part (UAA, backflow preventer, condensate drain).
This piece has only the condensate drain which connects to the UAA.


• Vent material: AL29-4C stainless steel Made in USA
• Certification: Tested to meet or exceed Underwriters Laboratories (UL) spec UL1738 and ULS636
• Approval: Cat II, III, IV venting
• Limited Lifetime Warranty


Z-Vent SVE Series IV Installation and Maintenance Instructions, 3" to 24", Single & Double Wall

Z-Vent Dimensional Specifications

Related Gadgets

No reviews exist


Type the characters you see in the picture...

The code is case-sensitive and must be entered exactly as above.

Share AQ3ES 4TWHVK3SII Bosch AquaStar 3" Horizontal Tankless Vent Kit