HOT WATER HEATERS
There are generally two major types of water heater for homes: the classic, traditional heaters with large tanks referred to as “tank” water heaters, and the smaller, boxier variety known as “tankless” water heaters.
True to their name, tank water heaters operate by heating water using either electricity or gas, then storing gallons of hot water within the large tank attachment. Cold water enters the unit from below the tank and is heated either by a gas flame or electrical elements within the tank, depending on the heating method. If gas is used to heat the water, then exhaust fumes are funneled out of the unit either via an internal flue, or a dedicated exhaust pipe, that leads to the outside.
The temperature inside the tank is regulated using an attached thermostat and control valve, and the pressure in the tank is maintained at a precise level, with a pressure-relief valve attached to release excess pressure. The water stays in the tank until a hot water faucet is turned on, piping hot water out of the top of the tank, and automatically triggering the tank to begin refilling again, restarting the heating cycle.
Tank water heaters are available in anywhere from 40- to 75-gallon tanks, have lower upfront costs than tankless water heaters, but use energy throughout the day and night to maintain the temperature within the tank; and if the tank is not full, it can take time for the water to come up to temperature. In general, electric models are slightly cheaper than gas models, and both have about the same lifespan, about 8–15 years depending on the model.
How about a Tankless Water Heater
Tankless water heater are generally smaller than their tank counterparts and attach directly to a wall within the home. Also called “on-demand” or “instantaneous” water heaters, these units do not store water within them. Instead, the tankless water heater works by only drawing water when a faucet is turned on. As water enters the unit, a flow sensor kicks on to activate the heating element — again, either gas or electric-powered — which heats the water as it passes over the heat exchanger. This allows hot water to exit the unit only when hot water is needed. Similar to tank units, tankless water heaters that utilize gas have a dedicated exhaust pipe to funnel out fume from heating.
Because tankless heaters don’t store water, and only use hot water when activated, they are generally more energy-efficient than tank heaters. Lasting up to 20 years, tankless waters are a bit more pricey than tank units. Additionally, some units are said to be less effective at heating water than tank units, but they provide hot water more consistently.
Which Unit is the Right Unit?
Both tank and tankless water heaters have benefits and drawbacks, and both can provide hot water for homes of any size. When researching which unit is best for your home, take into consideration the upfront cost of the unit, which unit better fits the size of your home (as choosing the biggest unit is not always best), and which appliances will be attached to the unit.
If you have any questions about finding the right type of water heater, or if you’re thinking about switching out the current unit in your home, reach out to professionals.
