Continuous gas hot water.

Im thinking of installing a 22 or 24 litre per minute unit that is mountable on the wall outside - I prefer these smaller boxes to the storage units because they take up too much space (and I hear the continuous are cheaper to run long term)
I have been offered one (a bosch? cant remember) with an electronically controlled thermostat which I dont think I need, least of all I dont want to pay to have installed.
Can anyone tell me the ins and outs of these continuous units and whether I need know anything particular? And what they might cost to install? (I know they are more expensive than the storage type)
thanks.
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Gas or electric, you cant mount outside if it freezes ever, your location? You should have a electronicaly controled unit unless you dont care about the water being overhot then cool with total output. Look at Takagi and Rinnai, Rinnai is the most efficient I have seen. How cold does your incomming water get. Units are rated at Gpm and temperature rise.
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This is Turtle.
I don't know about others but the Rinnai is a pretty good piece of equipment to install. The Gas model they have has a Flow rate of 8.5 Gallons per Minute and can handle 3 showers at one time. Here is a link to the Rinnai units.
http://www.foreverhotwater.com /
The word is Electric can work good but you need to own stock in the power company to get a high water flow rate from a electric tankless set up. Also you need to install a protection cover over your electric meter pan in case the wheel comes loose.
TURTLE
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