Our shower hydro flo VS2 is not hot enough.
The hot water out of the tap is so hot you can't run your hands under it and yet the distance between the hot water tank and the shower is very close so we are unsure why we lose so much heat.

http://www.heatweb.com/hydroflo/hfpic1.jpg

Is this your unit? If so your water temperature adjustment valve/control may be bad. Have you tried adjusting it toward the hot side? If its new return it. Did YOU install it? Has it ever worked right?

Consult a plumber and have an inspection done. If your hot water heater is old, it may simply have a build-up of sediment that is decreasing your available supply of hot water.

It is not a hot water heater Spaparts...it is a POWER SHOWER and most plumbers here in the USA don't work on them as they have yet to gain popularity over here...;)

I agree that Boards needs to consult either a plumber or the manufacturer of the unit so they can resolve the issue!

Mark