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Originally Posted by Brian Carlton
...A single "tankless" unit that would boost the water from about 100°F. to 165°F. would be perfect. However, that's a lot of climb and I'd need decent volume for the washing machine (maybe six gallons per minute or so)...
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What you need is something like a 'booster' heater used for commercial dishwashers.
Hubbell Model J Booster
From a brief read, you set the desired output (32F - 194F) and the controller gives you that temp up to the maximum flow rate. You have to figure out the kW required given your maximum temperature rise and flow rates, but for
edited: 130F-160F, or a 30F rise, at 6 gpm for the washer you need a 30kW heater. The electric service would be the equivalent of a house, 125A or so at 240V! Maybe a smaller 3gpm unit and let the washer fill slower? 
I can't say I have heard of a system such as yours, but it looks technically feasible. Price of such a booster, though, might be steep, as it is commercial duty. It would probably out-last your house, though.
