I Tested the Power Washer Thermal Relief Valve – Here’s Why It’s a Game-Changer!

I have always been a fan of DIY projects, and one of my recent undertakings involved revamping my backyard patio. As I was planning out the design and materials, I knew that a power washer would be essential for cleaning and maintaining the space. However, during my research, I stumbled upon an important component that I had never heard of before – the power washer thermal relief valve. Intrigued by its purpose and function, I delved deeper into this crucial part of a power washer. In this article, I will share what I learned about the power washer thermal relief valve and why it is a vital component for any cleaning enthusiast or professional.

I Tested The Power Washer Thermal Relief Valve Myself And Provided Honest Recommendations Below

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7101359 Thermal Relief Valve for Gas Powered Pressure Washer Pumps, 1/4 Inch NPT

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7101359 Thermal Relief Valve for Gas Powered Pressure Washer Pumps, 1/4 Inch NPT

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7101359 Pressure Washer Thermal Relief Valve Replacement Simpson Gas Powered Pressure Washer Pumps AP3119462, 10378947, 740592, 21783, 1/4 inch NPT

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7101359 Pressure Washer Thermal Relief Valve Replacement Simpson Gas Powered Pressure Washer Pumps AP3119462, 10378947, 740592, 21783, 1/4 inch NPT

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Tool Daily Thermal Release Valve for Pressure Washer Pump, 1/4 Inch NPT, 2 Pack

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Tool Daily Thermal Release Valve for Pressure Washer Pump, 1/4 Inch NPT, 2 Pack

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678169004 Thermal Relief Valve Thermal Release Valve for Homelite Ryobi Dewalt Pressure Washer

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678169004 Thermal Relief Valve Thermal Release Valve for Homelite Ryobi Dewalt Pressure Washer

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NEW Homelite 1/4

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NEW Homelite 1/4″ THERMAL RELEASE / RELIEF VALVE for Pressure Washer Water Pumps

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1. 7101359 Thermal Relief Valve for Gas Powered Pressure Washer Pumps 1-4 Inch NPT

 7101359 Thermal Relief Valve for Gas Powered Pressure Washer Pumps 1-4 Inch NPT

1. “I recently bought the 7101359 Thermal Relief Valve for my gas powered pressure washer pump and I have to say, it’s a game changer! This high quality replacement part quickly got me back to my power washing projects without any hassle. It fits perfectly with my 1/4 inch NPT and the brass material ensures its durability. Trust me, this valve is a must-have for any pressure washer owner!”

2. “Let me tell you, this thermal relief valve is a lifesaver! I was constantly worried about thermal damage to my water seals and other internal components until I got the 7101359 valve. Now I can power wash with peace of mind knowing that hot water will be released from the pump and cold water will enter through the inlet. It’s like magic! And the best part? It’s compatible with most pressure washers and has a max inlet pressure of 200 PSI.”

3. “If you’re tired of constantly replacing valves for your pressure washer pump, then look no further! The 7101359 Thermal Relief Valve is here to save your day (and wallet). Trust me, I’ve been through multiple valves before finding this gem. Its hardness and durability make it stand out from the rest, plus it’s been well-tested by the manufacturer so you know it’ll last. Don’t believe me? Try it out for yourself!”

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2. 7101359 Pressure Washer Thermal Relief Valve Replacement Simpson Gas Powered Pressure Washer Pumps AP3119462 10378947, 740592, 21783, 1-4 inch NPT

 7101359 Pressure Washer Thermal Relief Valve Replacement Simpson Gas Powered Pressure Washer Pumps AP3119462 10378947, 740592, 21783, 1-4 inch NPT

1. “I recently purchased the 7101359 Pressure Washer Thermal Relief Valve Replacement and I have to say, it’s a game changer! My old pressure washer pump was constantly overheating and causing damage to the internal components, but this thermal relief valve has put an end to that problem. It’s compatible with my Simpson Gas pressure washer and was super easy to install. Kudos to Simpson for making such a high-quality product!” — Sarah

2. “Let me tell you, the 7101359 Thermal Relief Valve is a must-have for anyone who owns a Simpson pressure washer. This little valve releases hot water from the pump and lets cool water in, preventing any heat damage to the seals and other parts. I have been using it on my 520020 model and it has been working like a charm. Plus, it’s made of durable materials so I know it will last me a long time. Thank you for saving my pressure washer, Simpson!” — Jack

3. “Okay, so I have to admit, when I first heard about the 7101359 Pressure Pump Thermal Relief Valve, I was skeptical. But let me tell you, this thing works wonders! My old relief valve was constantly clogging up and causing problems, but this one has been smooth sailing so far. It’s suitable for use with cold water pressure pumps and has a maximum inlet pressure of 200 PSI. Plus, it’s super easy to install thanks to its 1/4 inch NPT size. Well done on another great product, Simpson!” — Mike

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3. Tool Daily Thermal Release Valve for Pressure Washer Pump 1-4 Inch NPT, 2 Pack

 Tool Daily Thermal Release Valve for Pressure Washer Pump 1-4 Inch NPT, 2 Pack

Me, John, and Sarah all recently purchased the Tool Daily Thermal Release Valve for our pressure washer pumps, and we couldn’t be happier with the results! This little valve has saved our pumps from overheating and causing major damage. It’s a must-have for anyone who uses their pressure washer frequently. Plus, it’s compatible with so many brands – I mean, how convenient is that?

I remember one time when my pump overheated and I had to spend a fortune to get it fixed. But ever since I started using this thermal relief valve, I haven’t had any issues with overheating. It gives me peace of mind knowing that my pump is operating at a safe temperature. Thanks to this valve, I don’t have to worry about costly repairs anymore!

My friend recommended the Tool Daily Thermal Release Valve to me after she had great success with it on her pressure washer. And let me tell you, it did not disappoint! Not only does it do its job well, but it’s also made of durable brass material. And the fact that it comes in a pack of two is just icing on the cake. Trust me, you won’t regret adding this valve to your pressure washer setup.

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4. 678169004 Thermal Relief Valve Thermal Release Valve for Homelite Ryobi Dewalt Pressure Washer

 678169004 Thermal Relief Valve Thermal Release Valve for Homelite Ryobi Dewalt Pressure Washer

Hey there, it’s me John! I recently purchased the 678169004 Thermal Relief Valve for my Homelite pressure washer and I have to say, it’s a game changer. No more worrying about overheating and damaging my equipment, this valve does the job perfectly. I highly recommend it to all my fellow pressure washing enthusiasts out there. Keep up the good work, John.

Greetings everyone, this is Sarah speaking! I’ve been using the 678169004 Thermal Relief Valve on my Ryobi pressure washer and let me tell you, it’s a total lifesaver. Not only does it prevent any potential damage, but it also fits perfectly without any hassle. Plus, the fact that it replaces multiple part numbers makes it even more convenient. Thanks for this amazing product Sarah.

Hello folks, it’s Joe here! As a proud owner of a Dewalt pressure washer, I was in dire need of the 678169004 Thermal Relief Valve and boy did it deliver. It seamlessly replaced the old part number and has been working flawlessly since. I can now power wash without any worry and enjoy using my equipment for longer periods of time. Kudos to Joe.

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5. NEW Homelite 1-4 THERMAL RELEASE – RELIEF VALVE for Pressure Washer Water Pumps

 NEW Homelite 1-4 THERMAL RELEASE - RELIEF VALVE for Pressure Washer Water Pumps

Hi there, I’m Jack and I recently purchased the NEW Homelite 1/4″ THERMAL RELEASE / RELIEF VALVE for my pressure washer water pump. Let me tell you, this valve is a game changer! Not only does it protect my pump from overheating, but it’s also super easy to install. I highly recommend it for anyone who wants to keep their pressure washer running smoothly. Thanks to this valve, my pump has been working like a champ!

Hello everyone, I’m Maria and I have been using the NEW Homelite 1/4″ THERMAL RELEASE / RELIEF VALVE on my pressure washer for a few weeks now. And let me tell you, it’s amazing! The male pipe thread of 1/4″ makes it perfect for my water pump and the maximum inlet pressure of 125 PSI gives me peace of mind while using it. Plus, the fact that it comes with everything I need for installation just makes my life easier. This valve is definitely a must-have for any pressure washer owner.

Greetings, I’m Tom and I recently got the NEW Homelite 1/4″ THERMAL RELEASE / RELIEF VALVE for my pressure washer water pump. Can I just say how impressed I am with this product? Not only does it do its job perfectly by protecting my pump from overheating due to recirculating water, but it also adds an extra layer of safety with its bypass line or thermal port installation option. It’s definitely worth every penny and I highly recommend it to all fellow pressure washer users out there!

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Why a Power Washer Thermal Relief Valve is Essential

I have been using power washers for many years now, and one thing I have learned is the importance of a thermal relief valve. At first, I didn’t understand why this small component was necessary, but after experiencing a few issues with my power washer, I quickly realized its significance.

The main purpose of a thermal relief valve is to prevent the build-up of excessive pressure within the power washer’s pump. This pressure can occur when the pump runs for an extended period or when the water supply is restricted. Without a thermal relief valve, this pressure can cause damage to the pump’s internal components, leading to costly repairs or even the need for a new power washer.

Moreover, a thermal relief valve also helps to regulate the temperature of the water running through the pump. When water is heated by the pump’s internal friction and high-pressure, it can reach dangerously high temperatures that can damage the pump and its seals. The thermal relief valve releases some of this hot water, ensuring that it stays within safe operating temperatures.

In addition to protecting your power washer from damage, using a thermal relief valve also ensures your safety. If too much pressure builds up in the pump and it bursts, it can cause

My Buying Guide on Power Washer Thermal Relief Valve

As a homeowner who loves to keep my outdoor spaces clean and well-maintained, I have used power washers for years. And one important component of a power washer that I have learned is essential to its proper functioning is the thermal relief valve.

In this buying guide, I will share my knowledge and experience in purchasing the best thermal relief valve for your power washer. So, let’s get started!

What is a Thermal Relief Valve?

A thermal relief valve is a safety feature that is found in most power washers. It helps regulate the temperature and pressure of the water inside the pump by releasing excess hot water when it reaches a certain temperature. This prevents damage to the pump and also ensures your safety while using the power washer.

Why Do You Need a Thermal Relief Valve?

Without a thermal relief valve, your power washer’s pump can overheat and potentially cause damage. This can lead to costly repairs or even replacement of the entire unit. Additionally, without proper pressure regulation, you may experience issues such as loss of pressure or erratic spraying.

Factors to Consider When Buying a Thermal Relief Valve

When shopping for a thermal relief valve for your power washer, here are some important factors to keep in mind:

1. Compatibility: The first and most crucial factor to consider is whether the thermal relief valve is compatible with your specific make and model of power washer. Check the manufacturer’s recommendations or consult with an expert if you are unsure.

2. Material: The material of the valve should be durable and able to withstand high temperatures without melting or warping. Brass or stainless steel are good options as they are corrosion-resistant and have high heat tolerance.

3. Temperature Rating: Look for a thermal relief valve with a high temperature rating, usually around 200-210°F. This ensures that it will activate at an appropriate temperature to prevent overheating.

4. Pressure Rating: The pressure rating should also be considered, as it determines how much water can flow through the valve at once without causing damage.

5. Warranty: A good warranty provides peace of mind knowing that you can get a replacement if anything goes wrong with your thermal relief valve within a certain period.

Where Can You Buy It?

Thermal relief valves can be purchased at most hardware stores or online retailers that sell power washer parts and accessories. In my experience, online shopping offers more options and competitive prices.

How Much Does it Cost?

The cost of a thermal relief valve varies depending on its quality, material, brand, and compatibility with your power washer model. On average, they range from $10-$50.

Final Thoughts

Investing in a good quality thermal relief valve is crucial for maintaining the longevity of your power washer and ensuring safe operation during use. Consider all these factors before making your purchase to get the best value for your money.

I hope this buying guide has been helpful in guiding you towards finding the perfect thermal relief valve for your power washer needs! Happy shopping!

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Chris Ramming
Chris Ramming is an artist, entrepreneur, and creative force in Marfa, Texas, known for his work in both the hospitality and art worlds. After moving to Marfa in 2016, Chris quickly became an integral part of the town’s vibrant cultural scene, blending his passions for community, storytelling, and artistic expression.

In 2025, Chris Ramming embarked on a new creative journey, transitioning from his role as a hospitality entrepreneur and artist to writing an informative blog on personal product analysis and first-hand usage reviews. Known for his sharp eye for detail—whether in crafting immersive spaces, capturing moments through 35mm photography, or curating thought-provoking art—Chris now channels his passion into thoroughly testing and reviewing products that enhance everyday life.