http://www.tanklesswaterheater.com/products1.html
A buddy of mine has asked me to ask youse guys if the gpm rates are resonable up here in montreal in the dead of winter. Water incoming is probably about 45.
More info later today.
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Assuming you want 105 out of the hot tap, and are using the N-120 model, you will be able to get a little more than 1.5 gallons per minute (45 incoming + 64 raise). That will probably be adequate for a single user, but no washing clothes while in the shower, etc. The gas units produce more like 5-6 GPM at full crank. The last electric unit I checked out required (3) 60 amp circuits... the lights will dim in the entire neighborhood when the thing kicks on.