Product images: Amazon listings
Written from the listing's specs, not from our own use · How we rate
3/4" IPS isolation valves and a 150 PSI relief valve: the HYDRO MASTER 3/4" IPS Service Valve Kit covers what matters most in a valve kit. It is a good match for an install that skipped the service valves, at 7.2/10 on its documented specs.
| Brand | HYDRO MASTER |
|---|---|
| Category | Service kits, valves & parts |
| Stated gas input | 200,000 BTU/h |
| Connection | 3/4" IPS |
| Relief valve | 150 PSI, 200,000 BTU |
| Sold for | Rheem, Rinnai and EcoSmart |
| ASIN | B07KVCFT2K |
Full listing title: HYDRO MASTER Tankless Water Heater Service Valve Kit with Pressure Relief Valve 3/4-Inch IPS Isolator Clean Brass
| Stated gas input | 200,000 BTUListing text |
|---|
Rated from the listing's specs, no buyer reviews yet
What it's made for: an install that skipped the service valves.
Two valve kits of the same size, closest to it on our rating, each with a dated price.
The connection size the listing states. It has to match the water connections on your heater, or the kit won't thread on; the manual lists them.
What it has going for it
Relief valve, 150 PSI, 200,000 BTU. Most codes want a relief valve on a water heater. Check that its BTU rating covers your unit's input.
Lead-free brass. Required for anything on the drinking-water side in the US.
The listing names 3/4" IPS connections, with a relief valve set at 150 PSI and a 500 WOG rating.
Find the size of your heater's hot and cold connections in its manual before you order: a mismatch means adapters, or a second trip to the store.
What the HYDRO MASTER 3/4" IPS Service Valve Kit listing names:
In the box, per the listing: A pressure relief valve, Isolation valves.
Hold the figures against your own heater and its manual before you order.
On Sep 30, 2026, that price put it in the pricier third of the 12 valve kits we have a recent price for.
The button opens the exact listing (ASIN B07KVCFT2K), where today's price, stock and seller apply.
Our take
Our favourite thing about the HYDRO MASTER 3/4" IPS Service Valve Kit is 3/4" IPS isolation valves, closely followed by a 150 PSI relief valve. No buyer reviews yet, so the HYDRO MASTER 3/4" IPS Service Valve Kit has to win you over on paper. Where it falls short: the size has to match your heater's connections on both ends, or it simply won't thread on. We'd pick it if your tankless install has no service valves yet; otherwise, put it next to the Iococee 3/4" IPS Isolation Valve Kit first.
Before the HYDRO MASTER 3/4" IPS Service Valve Kit goes in your cart, check your connections: it is a 3/4" IPS kit with a 150 PSI relief valve, and your heater's fittings have to match.
Read the size stamped on the heater's water connections, or in the manual's spec table, and match it to the kit.
Rated 150 PSI and 200,000 BTU, per the listing. Its BTU rating has to cover your heater's input.
Soldered or threaded, it goes on the drinking-water side: a plumber if you are not comfortable. Our installation guide explains the rest.
How the HYDRO MASTER 3/4" IPS Service Valve Kit stacks up against the closest alternative, the Iococee 3/4" IPS Isolation Valve Kit.
| Criterion | HYDRO MASTER 3/4" IPS Service Valve Kit | Iococee 3/4" IPS Isolation Valve Kit |
|---|---|---|
| Our rating | 7.2/10 | 7.2/10 |
| Size | 3/4" IPS | 3/4" IPS |
| Relief valve | 150 PSI | 150 PSI |
| Valve rating | 500 WOG | 600 WOG |
Both score 7.2/10. The Iococee 3/4" IPS Isolation Valve Kit adds a higher WOG rating (600).
We rate it 7.2/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
Its listing states 3/4" IPS isolation valves and a 150 PSI relief valve. These are the seller's figures, not our measurements: whether it fits your exact heater is worth confirming first.
Your connections: read the size stamped on the heater's water connections, or in the manual's spec table, and match it to the kit. The relief valve: rated 150 PSI and 200,000 BTU, per the listing. Its BTU rating has to cover your heater's input. Who fits it: soldered or threaded, it goes on the drinking-water side: a plumber if you are not comfortable. Our installation guide explains the rest.
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.