Yesterday we installed a 3 liter instant water heater which uses 3 KW. After the install, hot water is coming through the tap, albeit very slowly. The cold water is coming fast. Our geyser was installed by an electrician who told us that instant geysers do not require pressure. How can I get the hot water to flow quickly?
Water – Hot water flow is slow from 3 L/3KW instant geyser (hot water heater)
water-heater
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Best Answer
30°C temp raise (10°C to 40°C) for 1L/min requires about 2,1kW of power. So with a 3kW POU you can't expect a big flow. An 'adequate' shower consists in about 6L/min. These are the numbers. Especially if main water is cold, instant POU are not enough, better to install a under-sink tanked heater (10L), it delivers much better flow even at higher temperatures.