Customer Reviews for Rheem Marathon 40 Gal. Tall 4500/4500-Watt Elements Non Metallic Lifetime Electric Tank Water Heater

Works like a charm, easy to adjust temp, looks like no other water heater in a GOOD way. Engenders confidence, since no corrosion with polymer material.

Purchased from HD 1 year ago. I felt it was expensive. Went in without issue, and heated water fast. Never runs low on hot water. More good news, my power bill went down. Issues: 1. The thermostat runs hotter than expected. Research confirmed this is a known issue. 2. After annual flush, discharge outlet leaks. Product support for possible warranty issue? Nada. Purchased 6/17/22; Delivered/installed 6/29/22. Parts warranty expired 4/6/23. What the???

After installing several different types of water heaters that either don’t work and/or don’t last, I decided to install this one with its non-metallic, corrosion-proof tank along with a stainless steel water expansion tank (with a REAL mounting bracket mind you), and brass fittings with stainless steel connections. Now I actually have confidence that I won’t be dealing with rust problems a few years down the road. Totally worth the investment. Also, it LOOKS LIKE A MISSILE!!!

I noticed some rust on the outside bottom of my 33-year-old hot water tank but no water on the floor. I flushed and changed the sacrificial rod every two years and water came out very slowly these past two times. Not wanting any surprises, I took preemptive action and decided to replace the tank. Research showed that the tank was made by Rheem and installed 33 years ago. Being very curious, I cut the tank in half to see if rupture was imminent. I found no noticeable rust inside the tank anywhere except around the rod connection at the top where a very small amount of water must have leaked out and worked its way down the insulation to the bottom skin. There was also about 6 inches of 'crud' in the bottom of the tank made up mostly of chunks of sacrificial rod pieces which hindered proper tank draining. There appeared to be no potential for tank rupture, but the 'crud' hindered proper operation of the lower heating element, so I'm glad I replaced it with 'I hope' to be another long-lasting Rheem hot water heater. Self-installation was very simple with flexible hoses and a minor adjustment to increase the water high temperature. So far, so good.

I like the concept (which is why i gave it 2 stars). Unfortunately this unit is poorly constructed. Because there is a glass lining, you have to be very careful not to break it because the plastic makes it that much more fragile. The inlet, outlet, and relief valve flop around until torqued to a fitting. If you put too much stress on any of those, you will break the glass lining. Takes up too much space (same size as a small refrigerator). It is top heavy and can tip very easily if you live in an area where you don't stap it to the wall. Mine leaked pretty bad under the inlet just below the plastic case. I'm sure that the good reviews are truthful but i think that they lucked out. These are so sensitive to damage that a lot of these units get sent back. Says in the manual if you need help, Rheem is available 7 days a week. I called at 10am on a Saturday and got a closed recording which did not state their operating hours. I returned it to the store.

This is the water heater model I had to have. From Magnesium to Aluminum to zinc Marathon. No one has a more potent water than what I have been dealing with. I was careful to take measurements because I knew it was going to be tight. I forgot to allow room for the thermostat covers. The plumber rotated it, so it was not a problem. I wanted this to look nice because it took a long time for me to save for this. I took out the top shelf. I glued some boards over the holes. Maybe I can buy some buy some poster board in the arts and crafts Section. I stayed with copper pipes and fittings-vertical installation. I wanted tees and pipes coming over and down. Everything is rigid and stationary so there is no lateral stress on the stub pipes. I thought it might keep the seals from leaking. I had the plumber install a ball valve. The expansion tank was an upgrade. The inspector will be coming out soon. Rheem states that it is necessary to have a drain no more than six inches in circumference under the relief valve discharge tube. I have a drain that is larger; and it could whisk away a lot of water. It is covered up right now though. The cat’s litter box is next to it. He prefers the drain. Overall, I think the plumber did a really nice job. I will have someone build new cabinets in the future.

I bought and installed this new in June 2014. It is May 2020 and the water heater is gushing water from the top. These are sealed and insulated so I can't tell what is wrong. Emergency plumber is $150 an hour so I'll wait till monday to call during normal hours. Also, Rheem is closed on saturday so I can't start the claim. Was trouble free for almost 6 years. Hope it doesn't take forever to get the new one/replacement parts so the family can take a warm shower.

I bought and installed this new in June 2014. It is May 2020 and the water heater is gushing water from the top. These are sealed and insulated so I can't tell what is wrong. Emergency plumber is $150 an hour so I'll wait till monday to call during normal hours. Also, Rheem is closed on saturday so I can't start the claim. Was trouble free for almost 6 years. Hope it doesn't take forever to get the new one/replacement parts so the family can take a warm shower.

I bought and installed this new in June 2014. It is May 2020 and the water heater is gushing water from the top. These are sealed and insulated so I can't tell what is wrong. Emergency plumber is $150 an hour so I'll wait till monday to call during normal hours. Also, Rheem is closed on saturday so I can't start the claim. Was trouble free for almost 6 years. Hope it doesn't take forever to get the new one/replacement parts so the family can take a warm shower.

Just had the 50 gallon Marathon installed. I love the idea of no anode rod, eliminating the sulfur smell and nonmetallic tank. As soon as it was installed it leaked from the top valve. I knew immediately from reading reviews it was a known issue from at least back in 2016 that Rheem indicated they would look into. I’m now stuck without a hot water heater til I can decide which to replace it with. Seems it’s the only one without the anode rod but I don’t want to take the chance replacing it from the same company. From my experience and reading reviews I wouldn’t purchase another one.

I ordered this water heater on 11-12-2018. Upon installing it, it leaked. I called Rheem in Montgomery and they authorized a warranty replacement. They said they would make an appointment with one of their approved contractors to replace it. The earliest appointment they could make was a week and a half away. The day before their contractor was supposed to come replace it, Rheem warranty services in Dover, NJ called and told me that the warranty on this water heater did not cover onsite service. They said I would have to return it to Home Depot for them to process the warranty return. The replacement apparently got dropped off the truck into the middle of the road somewhere. It's now March 2019 and I'm still waiting for my water heater. If I could give this water heater a rating of negative 10 stars, I would

Had to return. Box was torn open in multiple places and there was corrosion on the brass fittings. Also heater was 2 yrs 9 mos old so energy star rating was over $100 more per year than the one I purchased online. . I had to bring it back to the store myself. I did receive a full refund though including delivery fee.

We had one of these installed to solve the sulfur smell problem with the well water. We have not had any trouble with it. It is very efficient. We had electricity go out for a week once and the water inside was still lukewarm. The tank is plastic so pay special attention to the draining instructions!

All is going well so far thank you ~Cathedral Ledge Resort Intervale NH

We've beenin our house 11 years & have had to replace our 2nd tank. So our plumber recommended it as a life time option. Like the look, water is nice & HOT, looks good in the corner, the grey helps it fade away.

I installed this water heater because our well water is acidic. With the plastic construction of this heater the issue of the water heater tank rotting out will now be a non-issue.

I wanted this Marathon non metal unit due to rust and buildup issues from our well water. when i finally found a contractor that would do the Marathon which everyone else wouldn't due to they wanted to install their normal setup, the one I found that would take the job wanted $4,500. Sorry that was insane in my eyes for a water heater that's $1,500. So I decided to take to YouTube and web research and do the job myself which I did and saved so much money! it works great and hold the heat even during our power outs that happen up north during winter storms. Don't go nuts tightening the lines which you shouldn't do any ways and you wont have any issue. NOTE: when you turn the water on for the first time open the water line slow during the fill-up or the vacuum valve will leak and make you think you have a problem! ask me how I know! this is a safety think to prevent damage and again just open a hot water faucet valve and the water supply just let it fill up slow. I know its slow but relax and this time will let you do the electrical side or take a break. 100% would recommend and do this setup again 50 Gallon Marathon keeps up with our household of five no problem, 10 out of 10 would do again and do myself as it was easier than I was expecting.

using for a buffer tank on a geothermal system. I have high hopes for longevity since my last one lasted 8 years because it rusted out.

Water heater does not heat water like it should. Have to see how to turn the heat up. Water very very slow to provide hot water in the home.

The Rheem Marathon Water Heater is GREAT!!! I replaced the existing upstairs water heater because I have had great hot water with the two 80 gallon water heaters attached to my Geothermal Heat Pump system. My two 80 gallons were installed in 2017 and going strong.

We bought this water heater because the electric company my husband worked for was highly recommending them. My husband and a friend installed it with no problems at all. I love this water heater. We don’t ever have to worry about it rusting out or leaking water between the inside and inside of the water heater like our old one did. If we had waited any longer to take the polls one out, it would have completely destroyed itself and had 40 gallons of water damage to our house. The Marathon water heater can never do that and will never rust out. I fully recommend this water heater for everyone.

This water heater is built like a tank. There’s no metal Cason on this so won’t rot and replaced a new water heater and it’s well insulated.

We had a Marathon tank that we had 16 years with no problems. The tank cracked because one of the glued in fittings came lose. We replaced it with another one. We have only had our new water heater for a couple of months. I love how well insulated they are and how long they last.