We carry the Z-Flex vent pipe.
For tankless water heaters, it is single walled for model like the 22L NG DP – 45 HI.
Stainless Steel Z-Vent Wall Hung Water Heater Vent Kit For 22L NG DP – 45 HI.
This is for the Vertical Installation of 22L NG DP – 45 HI
(1) ___ 4″ Rain Cap
(1) ___ 4″ Top Support/Storm Collar
(1) ___ 4″ Adjustable Roof Flashing (normal 30 degree flashing)
(1) ___ 4″ Universal Appliance Adaptor
(1) ___ 4″ Back Flow Preventor
You will need to determine how many additional feet you will need as well determine if you will need a condensation drain.
Also remember there is a maximum vent run of 20 feet, subtracting 4 feet for every 90 degree elbow in the run.
Please also note that any vertical venting installation with more than a 5′ run length requires a vertical condensation drain pipe as well.