Thermostatically controlled which is ideal for busy people I have always bought this product I find it always reliable

On the very low temperature setting worming up the all place, excellent, excellent. Rinnai you done it again!!

Our new Rinnai Ultima II is so much more efficient than its 40 yo predecessor that it's is hard to believe we were ever happy with the old one.

The features i like best is the thermostat, i can set it on 21 degree & it keeps that temperature, It is the next best heat other than a wood heater. I would recommend this heater to anyone. I've put this gas heater in 2 of my home's, they are very economical to run as well.