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Rinnai Water Heater - Water Not Hot Enough
Our house was built in 2009 but this problem has existed ever since we bought it and it's gotten to the point that I should figure out how to fix this issue.
We have a Rinnai R75-LSi and next to it is a Heating Box KD-HBO100. I don't have a great idea of what the concept of the Heating Box is.
Anyway our house is part of a townhouse complex and all 8 townhouses have this issue. The first time I tried to take a shower, I noticed that the water was not hot enough for me so we called the builder of the house and asked why. He said we needed to turn on the heat with the thermostat and let the water run for 5 minutes. We did that and it worked - the water could get really hot and I thought it was fixed. The next day the same problem returned.
One of my neighbors thought it could be an issue with the electrical system and we had an electrician come by to fix it. I assumed he fixed it and I let him on his way but later that night it turns out the issue was not fixed.
In the summer, the water is fine and warm enough for a shower but come winter time every time you want to take a shower or wash the dishes, you need to turn on the heat first with the thermostat then run the water while the heat is on.
After some testing with the electrical outlets, I noticed that the electrical outlet where the Heating Box is connected to doesn’t have electricity and when you plug the Heating Box into the electrical outlet that the Rinnai is plugged into, the Heating Box turns on and just stays on. If you plug the Rinnai into the electrical outlet that the Heating Box is connected to - it doesn’t turn on. What confuses me is that when you turn on the heat through the thermostat, the Heating Box will turn on and run even though the electrical outlet doesn’t work. Not sure if it’s designed this way.
I tried leaving the Heating Box unplugged and just using the Rinnai water heater and the water doesn’t get warm enough – so it seems like Rinnai alone doesn’t get the water warm enough in the winter and needs the Heating Box to help warm up the water. My problem is how do I get the Heating Box to activate without having to turn on the heat through the thermostat or is that not the problem here?
I appreciate any help possible.