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(More customer reviews)This is the second Rheem tankless water heater I've installed during my ongoing-home-renovation project (I now have one on each end of the house).
Some things to be aware of:
1) There is a lag for the tankless water heater to kick in and start hot water through the pipes (three seconds?). My kitchen sink is on the floor directly above the tankless water heater and I have to run over a gallon of water out before I get hot water. For that reason I am going to install under-the-sink, pass-through mini-tank (2.5 gallon) electric water heaters in the kitchen and bathrooms for instant hot water.
2) In both cases I've direct-vented horizontally, through a stud wall that is in front of a 12" concrete block wall. The main horizontal 3"/5" pipe that comes in the direct-vent kit is too short to go through about 17" of wall, so I had to buy a longer 3"/5" pipe (for an extra $100) from Rheem to get through the walls. You still need to buy the kit, though, for the elbow and outside termination pieces.
3) This is subjective, but it seems the water in the hot water pipe gets cold faster than it did with the tank water heater. With a tank water heater you could get hot water, then come back 20 minutes later and the water was still fairly warm right away. With the tankless water heater it seems the water gets colder faster, so you have to run that gallon of water through the pipes to get to the hot water again. In both cases the hot water pipes were insulated.
4) About once every two-three months the wired-in remote control displays an error number...it has been different every time. The first two times the error number wasn't listed in the documentation, so I called for telephone support. Now I just unplug the unit, wait 5-10 seconds, and plug it in again. It starts right up.
5) I can't be sure it was only the swapping out of the water heater, but my gas/electric bill has been, on average, a bit lower since replacing my old 40 gallon gas water heater.
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