If you have a big house with more than one kitchen and more than one bathroom, and you need a lot of hot water, then you should get a tankless water heater. As you know, a gas based tankless heating system would be best for you. However, you may not have a gas supply. No problem, you can also use whole house electric tankless water heaters, which are designed to supply you with 8GPM of hot water.
I will give you an example of a whole house electric tankless water heater so you can approximately see how good they are. One example is enough because they all are very similar. The series 4 EX380(T4) from EEmax is a model that can generate a maximum flow rate of 8 GPM. It is designed to supply three bathrooms and a kitchen with hot water. The water is heated instantly, there is no delay. The EX380 with a T4 option also has the new staged technology built in, which saves more energy than other models. With this technology, the heating modules are used to produce the exact output temperature, the water will never be at a higher temperature. The water connections are 3/4 NPT and the size of the heaters is 20-3/16 x 12-1/8 x 4-1/8. The EX380(T4) also has thermostatic control, which is very useful, it means that the power is altered to the required flow. The minimum flow rate of this model is 1.8 gallons per minute and the highest flow rate is 8 gallons per minute.
The EX380(T4) model works at a voltage of 240 volts and has a consumption of 38 kW, the amperage is 160. Depending on the flow rate this model can heat the water at following temperatures: At a flow rate of 2.5 gallons per minute the temperature rise of the water can be 103 degrees Fahrenheit, at a flow rate of 3 gallons per minute the highest temperature rise of the water can be 86 degrees Fahrenheit, at a flow rate of 4 gallons per minute the temperature rise can reach 65 degrees Fahrenheit, at a flow rate of 5 gallons per minute the maximum temperature rise is 52 degrees Fahrenheit and at a flow rate of 6 gallons per minute the highest temperature rise is 43 degrees Fahrenheit.
In conclusion, if you need a tankless water heater that can provide you with loads of hot water and you don’t have a gas supply, you can also choose a whole house electric tankless water heater because it works great!