Types Of Water Heater
This is the oldest model in water heaters. The device has an insulated tank. When you power it on, the water is heated and stored in the tank. When you run your faucet, the hot water emerges through the pipes. If the temperature or pressure inside the unit exceeds the pre-set level, then there is a relief valve that opens up to release these.
If you are looking for storage tank water heaters, buy a unit that runs on gas rather than on electricity. The gas models consume less energy and therefore have a low operational cost. The upfront cost of gas models is more.
These are more energy efficient option than storage water heaters. They do not have a storage tank as evident from the name. They have heating coils which heat up the water the every instant you need it and send it to you through the pipes. However they have a limited flow of hot water per minute-about 3.5 gallons. They are only suitable for houses that do not have a high demand for hot water at the same times for example running a shower and dishwasher simultaneously.
Tank less models running on gas are a better choice over electrical counterparts. Installing an electrical model will require an expensive upgrade of the home's electrical capacity.
Heat Pump Water Heater
These trap the heat present in the exterior environment and transfer it to the water to make it hot. They are quite efficient, consuming 60 percent less energy than standard electric water heaters. They cost more than electrical or gas models but their payback time is short. They are not fit for regions that have extreme winters. Installing these is lot of work and they require considerable space.
These have solar cells on the rooftop that soak the sun's heat and transfer it to an antifreeze-like fluid. This liquid runs through a closed-loop system that runs to the water tank. They work well in sunny weather but homeowners that encounter cold and cloudy days at a stretch should not opt for these. Most models employ a backup system that kicks in when needed. Although federal and local discount schemes are available to install these, you may need 10 to 30 years to recoup your costs.
Tank less coil and indirect water heaters
These use a home's space heating system to heat water.
These are good options if you use gas as a fuel and need a unit with a capacity more than 55 gallons. They have storage tanks just like conventional heaters. These heaters use the heat of exhaust gases that would go outside through the flue to heat water. This heat is transferred to the water via a heat exchanger.