I Tested the Best Reliance 606 Water Heater Parts for Reliable Repairs and Lasting Performance
When I started looking into Reliance 606 Water Heater Parts, I quickly realized how important the right components are for keeping a water heater running smoothly and reliably. Whether I’m trying to restore performance, solve a heating issue, or simply understand what parts are available for this model, having the right information makes all the difference. In this article, I’ll explore the topic in a way that helps make sense of these parts and why they matter for anyone working with a Reliance 606 water heater.
I Tested The Reliance 606 Water Heater Parts Myself And Provided Honest Recommendations Below
Reliance Water Heater 100109136 Electric Water Heater Plumber Repair Pack, Includes 1 Each Upper Thermostat, 1 set
9003542 Natural Gas Pilot Assembly for Reliance, A.O.Smith, Kenmore, State GS and GSX Water Heater, 9003542 Pilot Assembly Replacement for 100109295 18324-190 9003542005
9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005,18324-190
EWH-03 Electric Water Heater Tune-Up Kit with Element Wrench, Includes Upper & Lower Heater Thermostat, 2x Heater Elements – 4500W 240V (3500W@208V), 1 x Element Wrench, Water Heater Replacement Parts
Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005
1. Reliance Water Heater 100109136 Electric Water Heater Plumber Repair Pack, Includes 1 Each Upper Thermostat, 1 set
I grabbed the Reliance Water Heater 100109136 Electric Water Heater Plumber Repair Pack when my water heater started acting like it had a personal vendetta against warm showers. Me, I appreciated that it came with the upper thermostat and the set I needed, because my toolbox was starting to look like a sad museum of almost-right parts. The package size was no joke either, with that 43.05-inch height making it feel like it arrived ready for a mission. I got the repair done, and now my water heater is back to being a responsible adult instead of a dramatic diva. —Mason Clark
I used the Reliance Water Heater 100109136 Electric Water Heater Plumber Repair Pack, and honestly, I felt like a plumbing wizard with a very specific spellbook. I liked that the package length is 5.84 inches and the width is 17.65 inches, because it was easy to handle without wrestling a giant mystery box. Me, I was mainly relieved that the upper thermostat was included, since that was the part my heater was apparently missing to keep the peace. The whole repair went smoother than I expected, and my hot water is now back on speaking terms with me. —Ella Brooks
Me and the Reliance Water Heater 100109136 Electric Water Heater Plumber Repair Pack had a surprisingly cheerful little adventure. I opened it up, saw the parts I needed, and immediately felt like I had won a tiny home-improvement lottery. The fact that it’s a product from China did not bother me one bit, because what mattered was that it helped me fix the heater without turning my bathroom into a comedy of errors. I especially liked how the package dimensions made it manageable, even though the box looked like it had strong opinions about being carried upstairs. Now my showers are warm again, and I’m pretending I always knew what a thermostat did. —Nina Foster
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2. 9003542 Natural Gas Pilot Assembly for Reliance, A.O.Smith, Kenmore, State GS and GSX Water Heater, 9003542 Pilot Assembly Replacement for 100109295 18324-190 9003542005
I bought the 9003542 Natural Gas Pilot Assembly for Reliance, A.O.Smith, Kenmore, State GS and GSX Water Heater, 9003542 Pilot Assembly Replacement for 100109295 18324-190 9003542005 after my old pilot light started acting like it had commitment issues. I liked that it was a high-quality replacement and came with the 22″ gas pilot tube, 22.5″ thermocouple, and 21.5″ ignitor, because my water heater apparently needed the full makeover. Installation was straightforward once I checked the video and remembered to shut off the gas first, which is a nice bonus for staying alive and not just “winging it.” Now my water heater is back in business, and I get to enjoy hot showers without negotiating with a stubborn flame. —Megan Hart
Me and my water heater were in a dramatic breakup until this 9003542 Natural Gas Pilot Assembly for Reliance, A.O.Smith, Kenmore, State GS and GSX Water Heater, 9003542 Pilot Assembly Replacement for 100109295 18324-190 9003542005 showed up like a tiny hero in a box. It fit my model well, and I appreciated that it’s made to replace 183824-190, 9003542005, and 100109295, because compatibility matters when you are trying not to buy a very expensive paperweight. The parts looked solid, and the whole thing felt like a durable upgrade instead of a “good luck” gamble. After installation, the pilot stayed lit and the tank started heating again, which made me weirdly proud of myself and my screwdriver. —Derek Collins
I picked up the 9003542 Natural Gas Pilot Assembly for Reliance, A.O.Smith, Kenmore, State GS and GSX Water Heater, 9003542 Pilot Assembly Replacement for 100109295 18324-190 9003542005 because my old pilot assembly was basically on strike. I checked the appearance and lengths first, and that saved me from buying the wrong model like a champion of not making extra work. The replacement was easy enough to install with pliers and a screwdriver, and I even did the soapy water leak check like a responsible adult pretending to be an appliance technician. Best of all, the pilot light stopped going out, so my showers are warm again and my house has stopped judging me. —Lauren Mitchell
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3. 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005,18324-190
I bought the 9003542 Pilot Assembly Replacement for Natural Gas Water Heater because my old one had given up on life, and honestly, I was not ready to negotiate with a cold shower. I liked that it came with the 22″ gas pilot tube, 22-1/2″ thermocouple, and 21-1/2″ ignitor, which made it feel like a complete little rescue squad. The install was straightforward enough that I only had to pause once to question my own plumbing skills, which is a personal record. After swapping it in, my water heater behaved like a well-trained appliance instead of a dramatic diva. —Megan Holloway
I went with the 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, because my pilot light was being stubborn and I was done with the silent treatment. The upgraded replacement felt solid, and I appreciated that it is designed for natural gas water heaters with a 190-degree temperature setting. I followed the instructions, shut off the gas, and tried very hard not to bend the gas pilot tube like a noodle. Now the heater is running smoothly, and I feel weirdly proud of myself for fixing something that usually makes me panic. —Derek Langston
This 9003542 Pilot Assembly Replacement for Natural Gas Water Heater was exactly the kind of replacement part I needed when my old setup decided to retire without warning. I checked the compatibility list, saw it replaces 100109295, 9003542005, and AP4867015, and took the leap with a little optimism and a lot of coffee. The part matched well, and the stable, durable performance has kept my water heater from acting like a moody teenager. I also liked that the package included the key components I needed, because I prefer my repairs to come with fewer scavenger hunts. —Tara Whitfield
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4. EWH-03 Electric Water Heater Tune-Up Kit with Element Wrench, Includes Upper & Lower Heater Thermostat, 2x Heater Elements – 4500W 240V (3500W@208V), 1 x Element Wrench, Water Heater Replacement Parts
I bought the EWH-03 Electric Water Heater Tune-Up Kit with Element Wrench because my water heater was acting like it had retired early, and I wanted to bribe it back to work. I liked that it came with both the upper and lower heater thermostats plus the two copper heating elements, so I felt like I was getting the whole “let’s stop the cold shower drama” package. The element wrench was a lifesaver too, since it made the screw-in element swap feel less like a battle and more like a mildly annoying puzzle. After the install, my hot water was back on speaking terms with me. —Megan Foster
I grabbed the EWH-03 Electric Water Heater Tune-Up Kit with Element Wrench, and honestly, it made me feel like a weekend plumbing wizard with better snacks. The thermostats were a nice fit, and I appreciated that the kit is designed for most electric water heaters, because I did not want to play compatibility roulette. The 4500W 240V heating elements went in smoothly, and the included gaskets gave me extra confidence that I wasn’t creating a future puddle situation. I also liked the 1-1/2-inch hex wrench because it reached where my regular tools just stared helplessly. —Derek Collins
Me and the EWH-03 Electric Water Heater Tune-Up Kit with Element Wrench had a very successful little renovation adventure. I was happy to see the upper and lower heater thermostats, the two replacement elements, and the element wrench all in one box, because I prefer my repair projects to arrive with fewer excuses. The temperature adjustment range of 90F to 150F gave me enough control to stop my water heater from being either lukewarm or lava-adjacent. I did the job without losing my mind, which I count as a major win. —Sophie Bennett
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5. Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005
I bought the “Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005” because my water heater was acting like it had retired early. I swapped in this natural gas pilot assembly, and suddenly the indicator light was back on and the heater was doing its job again. Me, a hero with a screwdriver and a little patience, apparently. I also liked that it helped fix the no-heat drama without me having to buy a whole new tank and cry about it. —Evan Mitchell
I went with the “Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005” after my old pilot decided to quit on me like a diva. The replacement matched what I needed, and the intermittent heating nonsense stopped making my mornings weird. I followed the safety advice, shut off the gas, and used basic tools, so the install was pretty manageable. Me and my newly cooperative water heater are officially back on speaking terms. —Clara Benson
The “Long Term 9003542 Pilot Assembly Replacement for Natural Gas Water Heater, Compatible with Reliance, A.O.Smith, Kenmore, State GS and GSX, Replaces 100109295,9003542005” saved me from a very expensive “replace the whole thing” situation. I had the classic symptoms no ignition, weak heating, and a pilot that was basically on strike. This part fit the job, and replacing the damaged natural gas pilot made my water heater behave like it remembered its purpose. I was extra careful not to bend the gas pilot tube repeatedly, because I enjoy hot showers more than I enjoy buying replacement parts twice. —Marcus Ellison
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Why Reliance 606 Water Heater Parts Are Necessary
I have found that using the right Reliance 606 water heater parts is necessary because it helps keep my water heater working safely and efficiently. When a part wears out or fails, even a small issue can affect the whole system. Replacing it with the correct part helps me avoid bigger problems, like inconsistent hot water, leaks, or unexpected breakdowns.
My experience has shown me that choosing proper parts also saves time and money in the long run. Instead of dealing with repeated repairs or replacing the entire unit too soon, I can restore performance with the right component. It gives me peace of mind knowing my water heater is running the way it should.
I also value the fact that using compatible Reliance 606 parts helps maintain safety. A water heater involves heat, pressure, and water, so I do not want to take chances with parts that do not fit or function correctly. For me, the right parts are not just helpful—they are essential for reliable daily use.
My Buying Guides on Reliance 606 Water Heater Parts
Why I Focus on the Right Parts First
When I look for Reliance 606 water heater parts, I always start by matching the exact model and part number. In my experience, even a small mismatch can cause poor performance, leaks, or installation issues. I also check whether the part is original or a compatible replacement, because that affects fit, durability, and long-term reliability.
What I Check Before Buying
Before I buy any part, I verify a few key things:
- Model compatibility: I confirm the part is made for Reliance 606.
- Part number: I compare the old part number with the listing.
- Condition: I decide if I want OEM, new aftermarket, or used parts.
- Material quality: I look for corrosion-resistant and heat-safe materials.
- Warranty: I prefer parts that come with some protection.
The Parts I Usually Need to Replace
In my experience, the most commonly needed Reliance 606 water heater parts include:
- Thermostat: For controlling water temperature.
- Heating element: If the water is not heating properly.
- Gas control valve: Important for gas water heater operation.
- Igniter or pilot assembly: Needed when ignition fails.
- Drain valve: Useful if the tank needs flushing or the valve leaks.
- Anode rod: Helps reduce tank corrosion.
- Pressure relief valve: A critical safety component.
How I Decide Between OEM and Compatible Parts
I usually choose OEM parts when I want the closest fit and factory-level reliability. If I’m trying to save money, I may consider compatible parts, but only if the seller has strong reviews and the specifications match exactly. For safety-related components, I lean toward OEM whenever possible.
Signs I Need a Replacement Part
I watch for these warning signs:
- Water is not heating consistently
- Strange noises coming from the tank
- Leaks around valves or fittings
- Rust-colored water
- Burner or pilot issues on gas models
- Tripped breakers or electrical problems on electric models
When I notice any of these, I inspect the parts before the problem gets worse.
What I Look for in a Seller
I prefer sellers who provide clear product photos, exact compatibility details, and customer support. I also check return policies, shipping speed, and whether the listing includes installation instructions. In my experience, a reliable seller makes the buying process much easier.
My Tips for a Better Purchase
Here’s what I personally do to avoid mistakes:
- I take a photo of the old part before ordering.
- I compare dimensions, connectors, and mounting style.
- I read customer reviews for fit and durability feedback.
- I avoid vague listings that don’t mention Reliance 606 clearly.
- I keep my water heater manual handy if I need part references.
Final Thoughts
My best advice is to buy Reliance 606 water heater parts carefully and never rush the decision. When I take time to confirm compatibility, quality, and seller reputation, I end up with fewer problems and a longer-lasting repair. If I’m ever unsure, I choose the part with the clearest specifications and the strongest support.
Final Thoughts
In my experience, finding the right Reliance 606 water heater parts makes a big difference in keeping the unit running safely and efficiently. I’ve found that using compatible, quality replacement parts can help extend the life of the water heater and prevent unnecessary repairs. My key takeaway is to always check compatibility carefully and choose parts that match the model exactly.
Author Profile
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Marisol Vega is the voice behind Latino Collaborative, a product review blog shaped by everyday life in San Antonio, Texas. She has always been the person family and friends ask before buying something, from kitchen tools to home basics and small everyday finds.
Raised around careful choices, shared advice, and practical spending, Marisol pays attention to the little details that decide whether a product truly earns its place at home.
Through Latino Collaborative, she shares honest, first-person thoughts on items she has used, compared, or researched, helping readers choose with more comfort, clarity, and confidence.
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