"Rich Hampel" wrote in message
...
The water temperature will soon reach a steady state once the heater
temperature 'equilibrates'. Typically such a heater will come up to
temp quite fast. My 7 gallon heater will heat to 'hot' water from the
engine loop in about 10-15 minutes. Was the same with an Atomic 4 as
it is with my 3QM30. Actually the cooler the water in the manifold is
actualy better ... less carbonate (salting) deposition.... and heat
transfer is regulated by the 'log mean temperature difference' - the
cooler the inlet water the better the overal heat transfer.


Thanks Rich - I think I will try it - It seems such an easy way to get some
hot water without a closed circuit system. Got to order the heater first!

GBM