Combustion gases, produced by gas-fired units, are exhausted through a dedicated, sealed vent pipe. Hot water then exits the heater and travels directly to the faucet or appliance-not to a storage tank. As the cold water passes over the heat exchanger it’s warmed to the preset temperature. Then, cold water is drawn into the unit and a flow sensor activates an electric heating element or gas-fired burner, which warms an internal heat exchanger. Here’s how it works: A tank-less water heater sits idle until a hot-water tap is opened in the house. And as you may have guessed, this type of water heater has no bulky storage tank. Tank-less water heaters are compact, wall-hung units that provide hot water for the entire house-not just single faucet-and are often called instantaneous or on-demand water heaters. Also, tank-type heaters burn energy (gas or electricity) day and night to maintain the water temperature, regardless of whether or not anyone’s using hot water, a phenomenon known as standby heat loss. The downside of tank-type water heaters is that they hold a limited supply of hot water and may struggle to supply enough hot water during high-demand periods. The incoming cold water then absorbs much of the heat from the gases. It operates at higher efficiency by capturing hot exhaust gases before they exit the flue and redirecting them through a coil at the base of the unit. If you’re shopping for a gas water heater, consider a condensing unit. Tank-type water heaters come in various sizes, ranging from about 20 to 80 gallons, but a 40- or 50-gallon tank is sufficient for most households. As the water level drops in the tank, it’s automatically refilled with cold water, and the whole process starts over again. When hot water is called for at a faucet or appliance, heated water is pumped out the top of the tank and through the home’s hot-water supply pipes. A pressure-relief valve prevents an excessive buildup of pressure inside the tank. An adjustable thermostat regulates and maintains the water temperature. Here’s how it works: Cold water enters the bottom of the tank and is heated by either a gas flame below the tank or electric elements suspended inside the tank. However, electric water heaters are more efficient than gas models and have higher energy-factor ratings.Īs its name implies, a tank-type heater has a large insulated storage tank that holds hot water until it’s needed. Generally speaking, gas water heaters are more expensive to buy than electric models, but cost less to operate because gas is cheaper than electricity. Self-Cleaning - Turbulence inducing cold water inlet-tube engineered to diminish hard water area sediment deposits.A vast majority of homes have conventional tank-type water heaters, which are powered by either gas or electricity.
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