It makes sense to thoughtfully look at your hot water requirements before choosing the right model of electric tankless water heater. Think about the requirements for all the appliances and faucets that regularly use hot water. Being aware of the amount of hot water you regularly use will help you determine the best tankless water heaters to add to your home. The amount hot water which is delivered to a faucet is measured in terms of GPM, or gallons per minute. The common term used for this is flow rate. 
 
Most regular homes need to have hot water available to more than one place at a time. Ways hot water is consumed in your home include taking a shower and running the washing machine and dishwasher. Most average sized homes will require a minimum of 3 GPM from their electric tankless water heaters. If you do not have very many sinks or appliances you may be able to purchase a tankless water heater with a lower flow rate. 
 
Adding up all the appliances and faucets in your home will give you a good idea of the type of flow rate you will need. Another thing you will need to think about is the electrical requirements necessary for an electric tankless water heater. To heat water on demand the unit will use a big surge of energy. You will need to have a 240 volt electrical outlet to plug in most electric tankless water heaters. Your circuit breaker will need somewhere between 1 and 3 60 amp circuits. 
 
Different electrical requirements will come with different models so be sure to look at the specific requirements for the system you want. You may need to select a system based on the electrical wiring in your home. The efficiency of an electric tankless water heater will be determined in part of the temperature of the water as it enters the sytem. Those who live in colder climates will need a larger capacity tankless water heater to compensate for cooler water entering the system.

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