Order Watts products by model number, published specs, and installation orientation. Don't order by brand name alone.
That rule came from experience. I manage office and facilities purchasing for a 400-person company across three locations. Since 2020, I've placed roughly 400 purchase orders, managed about $45,000 in annual spend across eight vendors, and become the person who hears about it when a maintenance request turns into the wrong part. Watts is the brand our maintenance team names most often when they need a valve or a recirculating pump. The trust is deserved. But “Watts” alone was never a complete order.
Here are the requests that land in my inbox a few times a year:
- “We need a Watts hot water recirculating pump for the east building.”
- “Order a Watts pressure relief valve. The old one keeps weeping.”
- “Can a double check valve be installed vertically?”
Each one sounds specific. Each one hides a spec decision that determines whether the part actually works.
Buying a Watts hot water recirculating pump: the first question I ask
The first recirculating pump I ordered was a photo match, not a spec match. Our maintenance lead said, “just get another Watts hot water recirculating pump, like the one behind the water heater.” I found a product photo that looked identical and submitted the PO. The pump was the wrong size for the loop, and the fix cost us a restocking fee plus a week of slow hot water in that building.
The part I missed is that a recirculating pump is selected for flow and head. The housing can look the same across models, but the impeller and motor ratings are different. A pump sized for a small point-of-use application isn't the same as a pump moving water through a long return loop. “Watts hot water recirculating pump” is a category, not a model.
Now I ask three things before buying:
- Is there an actual hot water return line, or is the goal simply faster hot water at a distant fixture?
- What's the model number stamped on the existing pump?
- What is the pump doing wrong: no hot water, frequent cycling, noise, or leaks?
Then I read the spec sheet myself and verify the flow rating and head pressure match the application. I don't do the engineering, but I can verify that the order matches the model the requester actually needs. That verification is my job.
What I check before ordering a Watts pressure relief valve
A weeping pressure relief valve sounds like a simple replacement. But the phrase “Watts pressure relief valve” covers a lot of ground. A relief valve on a water heater is often a temperature-and-pressure relief valve, meaning it responds to both heat and pressure. A valve on a heating loop may be pressure-only. Their set points, connection sizes, and approvals can all be different.
It's tempting to think a relief valve is just a brass fitting with a spring inside. The reality is that it is a safety device, and “close enough” is not a rating. I learned this the humbling way in 2024. The old valve was stamped with its set pressure, and I ordered the same pressure from a different series without checking the model listing for the application. The installer caught the mismatch before anything dangerous happened, but we paid for an extra visit and a second valve. The lesson stuck.
Now, if a maintenance request mentions a relief valve, I take a photo of the stamp on the old valve and pull up the Watts spec sheet for that series. If there's no stamp and no matching model, I ask the licensed plumber to specify the replacement. That's not a paperwork delay; it's how you avoid putting a safety component in service with the wrong ratings.
Can a double check valve be installed vertically?
Sometimes, but only when the specific model's published installation instructions say so. If the spec sheet doesn't show vertical installation, treat vertical as not allowed.
The term “double check valve” covers several devices. It can mean a compact dual-check backflow preventer, or a full-size double check assembly with test cocks. Most full-size assemblies we've ordered come with instructions that require horizontal installation. Some models permit vertical mounting, usually with flow in a specific direction, and only when the manufacturer has tested and listed that position. Vertical is not a universal yes.
Orientation matters because check valves depend on a spring, a disc, gravity, or a combination of the three to keep water from flowing backward. In an unapproved orientation, the check can seat unevenly, the valve can chatter, and a backflow assembly can fail its required field test. That means a technician comes back, a plumber re-pipes, or both.
This exact question reached my desk in 2024, when a plumber wanted to install a double check assembly vertically in a tight mechanical room. I called the supply house before guessing. The answer came back as a copy of the Watts installation sheet: horizontal only for that model. The plumber adjusted the rough-in before installation, and we ordered the right fittings. No rework, no surprise invoice.
What's changed since 2020, and what hasn't
When I took over purchasing in 2020, much of my product knowledge came from the counter person at our distributor. If I described a Watts part badly, I'd receive something “close” that wasn't the same. I didn't know what I didn't know.
The execution has genuinely changed since then. Watts spec sheets are easy to find online, and most include dimensional drawings, flow rates, pressure ratings, and orientation diagrams. Our distributor's portal links directly to them. I can check a part's details before I submit the PO, not after the wrong box arrives. That has cut our return rate noticeably.
The product lines changed too. Lead-free requirements reshaped what's available for potable water systems, and recirculating pumps now come with more controls and efficiency options. What was the obvious choice in 2020 may not be the right choice in 2025.
The fundamentals haven't changed. A relief valve still needs the right set pressure for the system. A double check valve still needs the orientation its listing requires. Watts publishes those requirements in writing for every product they sell.
Where my experience stops
I'm not a plumber, an engineer, or a code official. This article doesn't replace a licensed professional or an inspection authority. If a valve replacement is safety-related, and relief valves always are, get the right professional involved and check the local code.
The same discipline applies outside the Watts catalog. The maintenance shop asks me for welding consumables and pressure washer parts, and those requests need specs too. If a technician asks for a pressure washer unloader valve without giving me the pump model, I ask for the part number or a photo of the old valve before ordering. If the shop requests flux-cored welding wire, I ask for the AWS classification and wire diameter. Generic names save time in conversation, but they don't save money on a purchase order.
One last honest note: I still call a human when the spec sheet doesn't answer the question. Digital tools make the information more available, but they can't replace the judgment of someone who works with these components daily. The brand matters. The spec sheet matters more.