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How To Buy A Gas Tankless And Storage Hot Water Heater...How do I choose the perfect electric hot water heater... Part 2? ...Capacity and On Demand Factor back to part 1 When you want to purchase an electric hot water heater, there are two critical factors that you need to consider. These are the Energy Factor and First Hour Rating. These two factors are explained in detail and you can go there by clicking the relevant links below... Hot Water Heaters Energy Factors First Hour Rating For Hot Water Heaters A water heater should be able to satisfy the hot water needs of the household for it to be deemed a worthy water heater. There is no point in having an efficient electric tankless or storage hot water heater that does not cater for the needs of the family... However this is far from true... The question to ask yourself is "does your on demand tankless hot water heater meet all your family requirements?" Having Cooler Temperatures Will Help You Lower Energy Costs... Tankless water heaters are much more 30% more efficient than tank storage hot water heaters. Companies that manufacture tankless heaters claim that their units provide an endless supply of hot water but this is far from true as you will see here. A tankless heater that supplies 2 gallons per minute will not be able to supply 3 gallons per minute at the same temperature. The heater will alter the flow to allow the set temperature to be attained or it will maintain the flow rate and lower the temperature of the "hot" water. You can use this formula to work out for a tankless gas hot water heater.... for a given unit the energy is divided as follows ... Electric Energy = flow of water x (temperature out - temperature in) If the water flow increases the difference between the in and out water temperatures must also be reduced. Here are some examples for a gas fired hot water tankless heater of energy capacity 10 kWhr For temperature change of 60 degrees F the maximum water flow could be about 1 galls per minute For a temperature change of 40 degrees F the flow could increase by 50% to about 1.5 galls per minute This table shows range of flows that can be expected from tankless gas water heaters operating on a temperature increase maximum of about 80 degrees F
It is clear that the large tankless hot water heater systems can supply 3 gallons per minute, which is very little especially at peak times... You can read a wide range of water usage articles. They discuss the use of water in the house and home ... topics covered include filters, heaters, softeners and water in the garden. |
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