rinnai tankless

I’ve had issues with my Rinnai water heater for the past month. The water was taking a while to heat up and I knew it was time to descale the unit. I got a plumbing company to come and they said the same thing but quoted me $700 to descale/flush and change the check valve. I decided to descale...

So I got my external tankless installed and the water heater out of the attic. So far, so good—very pleased with its performance. However, when I bought the unit (RU199en w/ "Circ-Logic"), I also bought a recirculation pump—the GTK03. I couldn't get that to work; I installed it with a crossover...

Hey there, new to the forum here. I just ordered a Rinnai RU199en and it seems I’m going to need to run a new 1-inch line to it. The Rinnai has a 3/4 inch fitting for the gas line; would I just use a 1-inch reducing coupling at the point of entry? Or can I run the 1-inch line to the wall where...