Recent content by JorgeO

Thanks again! One last question - suggested internal tube and external tube diameters? As I've posted before, I'm in contact with Rinnai to see if is there a way to set the servo to a lower temp. Otherwise, I will try this design with a length of about 1 meter in the heat exchange part...

Thanks, NeuronsAtWork Your link was most helpful! Now, could we go back to the original question (BTW, regarding thermodynamics my knowledge is very close to zero...)

Guys I'm a retired EE with a second degree in telecoms. Before going to college I had worked as a service technician. Mixing hot and cold water would require masonry work, and it would be much cheaper to purchase a heater from another supplier (minimum temp 30 deg C), no way to return the...

Roman I've already tried you suggestion. There's the hot water pipe/tap, the cold water pipe/tap, and they join to a single shower pipe. I've tried opening the cold water tap, the hot water one and then I started closing slowly the hot water tap hoping they would mix. But then the hot water...

Not so simple here. The tankless heater is associated with a small pump so water pressure from it is about 7m water column, while the cold water comes from a tank about 1m above the shower. So, if one tries to mix cold water to the hot one, the pressure will pump hot water into the cold water...

The heather is used for bath shower, taps, etc. Minimum servo temp is 37 deg C and to me this is hotter than I like to shower during summer. During winter I would rise servo temp setting if needed (plenty of room here).

Thanks, Roman

Hello, my first post. I hope this is the right forum... I'm considering a heat exchanger to solve a problem. I've purchased a tankless water heater for home usage - look at it as a black box, cold water flows in, hot water flows out. Output temperature is quite constant due to a digital...