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Hot water energy needs offer a good practical example of how energy scale & typlology matters.

Good Graphic, needs XP Acrobat?

4 Understanding Renewable Energy Systems

Figure 1.1 Prices for Water Heating

Gas stove

Electric stove

Microwave

Water boiler

Electric kettle

Energy demand in Wh/litre

Costs for 10,000 litres in €

0 50 100 150 200 250 300