Thanks for sharing your experience.

We ended up with a T36.  Installed in the summer and first fired up before Thanksgiving.  The water was not super hot but enough for shower, etc.  I noticed that every time we have to turn the hot on full for 10 seconds before warm water starts.  I guess we'll get use to it.

We are working on the bathroom this winter.  When it's done and we have a shower, we'll find out if we really like the tankless heater.

p.s.  this is pnwdiy, I lost my ID/password when upgrade computer.

I have the Bosch Powerstar AE-125 and am only generally happy. Flow control is poor (easy to end up with cold water if you put the shower in soap-up mode) and it will not kick one with input temps above 87° (meaning I cannot pre-heat the water, either through solar or any other significant way). With a need for an 80° delta in January/February, 2 gpm isn't so nice. Flow control is a joke with this unit as well - they ask you to put a ball valve on the output side and throttle flow that way to get the required temperature at an open spiggot.

If I had to do it again, I'd have elected my boiler with priority for DHW. As it stands, I may end up getting an additional heat exchanger for my boiler, putting the output of the Bosch tankless (which turns on with flow control) into the inlet of the heat exchanger for my boiler, thus making it so that I can remove the flow meter on the Bosch. The Tempra units don't have maximum inlet temperatures at such a low figure and, from what I understand, are self governing (meaning I can get more gpm's out of them when the inlet is higher.