Tankless water heaters are the result of innovative design and engineering. In the case of an electricity-powered water heater, when you open a tap, cold water enters the heater and triggers a flow sensor, which activates the circuit. The heating element gets energized and heats the water which flows out of the tap. When you close the tap, the flow sensor detects the lack of water and turns off the heat. This process is called self-modulation technology, which results in energy savings.

Choosing the right tankless water for a large home
A large family needs a lot of water, especially on a busy morning with everyone getting ready for work or school. An important factor in choosing the right heater is to know about the temperature rise. If you need water at 105 degrees F and the incoming water temperature is 50 degrees F, you should look at a heater with a temperature rise factor of 55 degrees. Another crucial factor that you need to consider is the flow rate of each appliance, like a bathtub, shower, washing machines, dishwashers, and sink. Bathtubs will have higher flow rates at four gallons per minute at 102 degrees F, while kitchen sinks will have a flow rate of 1.5 gallons per minute. Tankless water heaters with a GPM rate of five or higher will be ideal for large houses.

Based on the above features and factors, tankless water heaters ideal for large homes are:

EcoSmart ECO 36 KW Electric
An ideal model to supply water for large households and mansions, the heater can supply water to two showers without reducing the force of water. It is easy to clean and maintain. It comes with a good warranty and a replacement guarantee of the metal components like stainless steel and copper pieces. It can provide 3.6 to 8.7 gallons of hot water per minute. It costs $599.

Black and Decker 29 KW Electric
Ideal for a house with three bathrooms, it can supply hot water to about six devices simultaneously. It has a good GPM rate of 5.7. The unit is lead-free and CETL certified. You also do not need to spend extra or additional vents. You can install the heater in your garage, basement, or utility cabinet. It has a digital control panel, and you can set desired temperatures at an increment of 1 degree F. It costs around $399.99.

Stiebel Eltron Tankless Water Heater – Tempra®
It has a sleek, space-saving design, with digital displays and a memory that can store pre-set temperatures. It has an impressive water flow rate of 7.5 GPM. It is ENERGY STAR® certified because of its “self-modulating technology.” There is no need for a vent, and it is easy to install. The water temperature is maintained constantly throughout your shower. It comes with a seven-year warranty for leakage and a three-year comprehensive warranty. It costs around $650.

Rinnai RRL94iP large Propane
It can supply water up to 9.8 GPM and is ideal for a house with multiple bathrooms or if you have a jacuzzi or hot water spa at home. It is propane gas-powered and should be installed indoors only. It is energy-star qualified and is fitted with Circ-Logic technology. It is durable and corrosion-free, and the water temperature is consistent throughout. It costs around $1,500.

Takagi T-H3S DV-P
Inbuilt with safety features, this propane-based indoor tankless water heater is ideal for cold climates and can be used for altitudes up to 10,100 feet; and can supply warm water for four showers simultaneously in warmer and three showers in colder climates. It has a GPM of 8, and the unit is ideal for residential and small commercial establishments like a restaurant or a beauty salon. It costs around $1,000.