"JDS" wrote:
I am also interested in these tankless heaters... What concerns me is
the minimum flow rate to trigger the heating action... Would a faucet
that was not on full blast (ie a trickle for washing dishes) be enough
flow to trigger the heater?

I've had a Takagi for a couple of years. The only problem with faucets is it
takes longer to get warm water than with a tanked unit (the heater doesn't come
on "full bore" with at low flow, so it takes longer to heat up the heat
exchanger). Never had a problem with it simply not triggering.