Product images: Amazon listings
Written from the listing's specs, not from our own use · How we rate
The ThermoMate 3" Vent Pipe Kit keeps it simple: a vent kit with 3" stainless horizontal venting. Think of it for finishing the vent run of a gas tankless: 6.8/10 on what its listing documents.
| Brand | ThermoMate |
|---|---|
| Category | Service kits, valves & parts |
| ASIN | B0H6B7M2J5 |
Full listing title: ThermoMate 3" Vent Pipe Kit, Universal 3 Inch Stainless Steel Horizontal Vent Kit for Most Gas Tankless Water Heaters, Includes Termination Hood, 90° Elbow, Vent Pipes, Wall Thimble
Rated from the listing's specs, no buyer reviews yet
What it's made for: finishing the vent run of a gas tankless.
Two vent kits close to it on our rating, each with a dated price.
The size the listing states. Diameter, material and termination all have to be on your heater maker's approved list; venting is the one part of a gas install nobody should improvise.
The listing names 3" venting, stainless steel and a horizontal termination.
Only venting on your heater maker's approved list is safe to use. Match the part number in the installation manual before you order.
The seller states, word for word, in the ThermoMate 3" Vent Pipe Kit listing:
Horizontal vent pipes are designed for residential tankless water heaters.
Detachable horizontal vent pipe kit designed for indoor tankless water heater, can be assembled in lengths to suit your needs.
Quoted from the listing, not checked by us. Hold every figure against your own heater before you order.
What the ThermoMate 3" Vent Pipe Kit listing names:
In the box, per the listing: A vent termination, Elbows.
Check these figures against your heater's manual before you order.
On Sep 30, 2026, that price put it in the pricier third of the 7 vent kits we have a recent price for.
Gas and vent work is a job for a licensed installer, and the permit, where your town asks for one, comes on top.
The button opens the exact listing (ASIN B0H6B7M2J5), where today's price, stock and seller apply.
Our take
The best thing about the ThermoMate 3" Vent Pipe Kit is 3" stainless horizontal venting. No buyer reviews yet, so this ThermoMate vent kit has to win you over on paper. The catch with the ThermoMate: no word on the exact models it fits. We'd pick it if your heater manual lists this exact vent system; otherwise, put it next to the VATTCEEL 3" x 5" Vent Kit first.
Before the ThermoMate 3" Vent Pipe Kit goes in your cart, check your heater's vent list: it is 3" pipe, and only the vent parts your heater's manual approves are safe.
This is 3" pipe. Only the vent components your heater's manual approves are safe. Same diameter is not enough.
Distance to windows, doors and the ground is set by the manual and local code. Our installation guide covers the questions to ask.
Venting carries exhaust out of the house: a licensed plumber or gas fitter signs it off.
How the ThermoMate 3" Vent Pipe Kit stacks up against the closest alternative, the VATTCEEL 3" x 5" Vent Kit.
| Criterion | ThermoMate 3" Vent Pipe Kit | VATTCEEL 3" x 5" Vent Kit |
|---|---|---|
| Our rating | 6.8/10 | 6.8/10 |
| Fits | Not stated | Navien, Rinnai and A. O. Smith |
| Size | 3" | 3" x 5" |
Both score 6.8/10. Compare the listings side by side to choose.
We rate it 6.8/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states 3" stainless horizontal venting. These are the seller's figures, not our measurements: whether it fits your exact heater is worth confirming first.
Your heater's vent list: this is 3" pipe. Only the vent components your heater's manual approves are safe. Same diameter is not enough. Clearances: distance to windows, doors and the ground is set by the manual and local code. Our installation guide covers the questions to ask. Who installs it: venting carries exhaust out of the house: a licensed plumber or gas fitter signs it off.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.