Water heaters are devices that use a heat transfer method to heat water above the initial liquid temperature. Typical domestic applications of hot water are cooking, bathing, cleaning, and water heating in space. In commercial industry, hot water heated to pressure have several uses. These may include filling in small gaps around pipes or furnaces, transferring hot water between different systems, heating pools and, in some cases, as emergency water heaters.
In the old days, water heaters were large heavy affairs, requiring separate furnaces and boilers for each and every household. They were obviously too costly to employ, so many residences did not have them. Nowadays, smaller units called tankless boilers can be installed in homes. Tankless boilers do not store water they heat, so there is no requirement to build huge vaults for storing the water. Tankless units are also known as electric underfloor heating units, because the water heats up the ground and the water then flows into the unit, which is completed later. This is much more environmentally friendly than traditional tank boilers.
In addition to using water heaters, some heating systems use heat pumps. These types of systems can be used to provide both heating and cooling services, although they are not as widely used as water heaters. A heat pump merely involves pumping hot water from somewhere and then circulating it throughout a house.
There are two types of fuel sources used to power water heaters. They are gas and electric. Natural gas is the more popular choice, because it is cheaper than propane. It burns cleaner and does not cause any pollution. Electric boilers work through the same principle, but are a little more efficient, so they cost a little less.
As mentioned earlier, there are two different types of water heaters – on-demand and off-demand. An on-demand heater simply gives you hot water when you want it, without waiting for a specific time. The downside to on-demand heaters is that if you don’t have any cold water in the tank when you turn on the machine, the unit will run on nothing. This can waste a lot of electricity and water, and it is illegal in some places to use this type of energy.
Off-demand water heaters give you more control. You can choose what times you want the water heated and when you want it to cool off. The downside to an off-demand heater is that they are expensive to operate and they take up more room than electric water heaters do. This is because gas and electric units have to be housed in a separate room from each other, which adds to the cost. Gas and electric water heaters can also be linked to your existing gas or electric grid to help cut down on the costs.