Water heating appliances use an energy source to raise water temperatures. Water-heating appliances can supply hot water continuously. Correct installation and maintenance for any type of water heating appliances can raise its energy efficiency levels. Periodic maintenance is recommended to extend the water heaters life and ensure levels of efficiency. There are two main varieties of water heaters, storage and tankless. Daily use of hot water can sum up around 76 – 78 gallons.


Storage water heaters are commonly used for domestic use, they can hold up to 20 – 120 gallons of water depending on the size of the storage tank.

These appliances heat the water that’s on the surface, leaving the lower part of the tank with cold water. When in use, the heater delivers the warm water on the top first, gradually nearing the coldest part of the tank.  However, storage water heater can lose heat throughout the day even with insulated walls.

To know how many gallons of hot water a storage water heater can deliver within an hour check the first-hour rating.



Tankless water heaters take time to deliver hot water, but can maintain plentiful amounts of water at high temperatures consistently. Simultaneous uses of the tankless devices can limit its heating, to solves this you can install more than one for higher demands of heated water. A tankless water heater can have a higher initial value but it’s later compensated through operating and energy costs.

These heating devices can have a 20-year life expectancy compared to the storage water heaters that have 10 – 15 years. Tankless heaters also have easily replaceable parts.