In article .com,
says...

I need a unit for a whole house, 2 bath, 2 lavatory faucets, 1 kitchen
faucet, 1 dishwasher, 1 clothes washer.

We're quite happy with a Takagi TK-2 for the same number of fixtures, two
adults and three kids and no end of hot water.

--
is Joshua Putnam
http://www.phred.org/~josh/
Books for Bicycle Mechanics and Tinkerers:
http://www.phred.org/~josh/bike/bikebooks.html