Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

super easy to install and has been working great for a long time.. i would say it takes up to 30 seconds to a minute to get hot with our plumbing system. but it is cold here and our water comes from a well. but waiting 30 seconds for an endless hot shower is a great trade off,. i love it,.

We did hire an electrician and a plumber to be on the safe side and to get it done quickly. This works with our 100 amp service as we are also efficient in our electrical needs and uses. We are only 2 in our household. Our kitchen sink is against a wall of the bathroom. In the bathroom we have a sink, tub with shower, toilet, and a front-loading washing machine which is energy efficient and we wash usually with cold water anyways. We found that we preferred to set the water temperature to 109 degrees F. It can be turned up to 140 degrees. It takes the same amount of time that our gas hot water tank had taken to warm up. But it stays even once it comes to the temperature it is set at. More even and does not run out and plenty hot enough at our setting. We forget we have it. It will pay for itself within a couple years and we save on water heating from 24/7 to only as needed or wanted. Love it!

I purchased the 13kw unit to try out a low budget hydronic in floor heating system. I didn't have much room to work with so this unit worked perfectly. I'm only running just shy of 3gpm through it at 110 degrees f with an inlet to outlet difference of less than 20 degrees f so this thing is perfect. Happy with it so far, hopefully it holds up the way I'm using it.

I paid about $240 for this unit, servicing a 1300 sq ft cabin with 1 full bath, a half bath, dishwasher, washer and a kitchen sink. Item works extremely well, water gets hot in bathroom almost instantly, the unit in in basement below bathroom. Kitchen is about 20 ft away on first floor and it takes about 45 sec to get fully hot. Upstairs bathroom gets hot in about 2 minutes being furthest away and having a long run of pipe to get to. I did all the labor myself and put in a 60 amp breaker in my panel and it cost about $500 total with parts. The 6/2 romex wire cost about $150 for 50 ft so that was priciest part aside from unit. If you have any sort of building ability just put it in yourself and save the $$. All it needs is connected to water lines and the wire run from panel to the unit, it takes 2 hot wires and a ground (240v, all the power gets dumped into the heating element so no return voltage with neutral wire). I replaced an 80 gallon Rheem electric tank heater that was almost 30 years old and working fine until I flushed the tank and probably broke rust off the heating elements so it started tripping the breaker constantly. I am now saving a ton of electric costs in not having to heat 80 gallons of water for a smaller home that doesn’t need that much. I noticed if you run the shower, washer and dishwasher at same time the temp will cycle between hot and colder water in the shower because it can’t handle that many high flow items at same time. A shower and dishwasher or shower and washer at same time no problem however. I can’t recommend this unit more, I tell people about it all the time! Great value for money, especially if you install it yourself. Just follow directions to the letter and make sure you use proper breaker types in your panel (QD vs QO, etc).

Had to return because there was no way to drain water from tank to prevent freezing. I did return it.