4" Diameter Thru-Wall Tankless Water Heater Vent Kit w/Backflow Stop


Weight: 7.00 lbs

Rush Order:

Z-VENT Wall Mounted/Sideways Vent Kit for Tankless Water Heaters. 4" Diameter Stainless Steel pipe system.

Save time and money with this convenient, preconfigured vent kit for tankless water heaters

Kit contains the following components, all 4-inch diameter:
1 Universal appliance adapter with backflow preventer (damper)
1 90° elbow
1 1-foot length straight pipe
1 1.5-foot length straight pipe
1 Wall thimble
1 Termination hood

Note that this kit does not include a condensate drain pipe which may be required depending on your water heater manual guidelines and building code.
This one can replace the first item in this kit because it is a 3-in-1 part (UAA, backflow preventer, condensate drain).
This one with only the condensate drain can be connected to the UAA in this kit.

This kit is similar to the 2ZVW04 kit, except the UAA in this kit has the backflow stop.

Compatible with many non-condensing tankless water heaters, including the following:
Takagi T-KJr2-IN-LP Indoor Tankless Water Heater, Propane
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas
Takagi TK-110U (AT-KJr3U-IN, TK110UING, TTK110UING), TK-310U (TK310UING, TTK310UING), TK-510U (TK510UING, TTK510UING)
State GTS-110U-NI (SGTS110UING), State GTS-310U-NI (SGTS310UING), State GTS-510U-NI (SGTS510UING)
A.O. Smith ATI-110U (ATI110U00N, AATI110U00N000000), ATI-310U (AT3110U00N, AAT3110U00N000000), A.O. Smith ATI-510U (AT5110U00N, AAT5110U00N000000)
Marey 5L Propane and Natural Gas
Marey 10L Propane and Natural Gas
Eccotemp EL22i-NG and EL22i-LP
Eccotemp 45HI-LP and 45HI-NG

Also space heater Mr. Heater Big Maxx MHU50, MHU80, MHU125

Frequently Asked Question ("FAQ")

Q: Will this work with a Mr. Heater Big Maxx heater?
A: There are different models of Mr. Heater Big Maxx, some with 3" vent pipe connections, and some using 4" vent pipe. For the ones that have a 4" flue opening, then this kit is compatible. For the ones that have a 3" flue opening, then consider our 3" horizontal vent kit with backflow preventer here. Note that for your particular installation situation, you may need additional parts. Installation should be done according to building code.

Made in America


• 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

Alternate SKU: 2ZSVWB04

Related Gadgets

Average Customer Rating:

4 most useful customer reviews
Mary Henrikson
Jun 26, 2020
This customer purchased this item.
Great service, timely arrival to Alaska and most of all instruction and description of item was important and stated.

Advantages: just what I needed.

Disadvantages: none
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Steve Metscher
Nov 11, 2017
This customer purchased this item.
First and foremost, I'd like to thank the staff at GadgetsGo for accommodating my needs. Their customer service is epic, sonic delivery, and the best online prices!!
Thanks again!

Advantages: Very high quality stainless steel material and manufacturing. Each piece fit perfectly with no leaks. I applied a small amount of lithium grease to the seals which made assembly much easier. The grease will burn off shortly after use. I did have to trim 2" off one piece which was very easily done with a small cut-off air tool.
I would recommend this product do to the ease of installation plus it looks really cool. The main reason I purchased this kit was its made of stainless steel. It will not leave a rust stain on the outside wall and will last for many years.

Disadvantages: Being high quality stainless steel, the edges of the pieces are very sharp. Just be careful while handling. Wearing gloves helps a lot.
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Sep 5, 2016
This customer purchased this item.
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May 14, 2016
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