do you need an expansion tank on a tankless water heater?
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Expansion Tanks and Tankless Water Heaters Most tankless water heaters (electric or gas) do not need a thermal expansion tank. ... This creates an open plumbing system that does not require a thermal expansion tank to control thermal expansion. When the hot water tap is turned off, the plumbing system is closed.
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With proper maintenance, a gas water heater tank should last between eight to 12 years. An electric tank typically offers up to 15 years of quality use, while the life expectancy of tankless electric water heaters can surpass 20 years. Check your warranty for the most accurate timelines.
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A four-person household typically needs a 125–160L tank for a continuous system or 250–315L for off-peak. Can be installed indoors or outdoors. Electric instantaneous water heaters are also available. They range in price from about $300 to $1500 (not including installation).
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An expansion tank usually has a much smaller inlet hole than a pressure tank. But if it has a full open 3/4" port it can work as either an expansion or a pressure tank.
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Expansion tanks are pre-charged with a 40 PSI air charge. If the inlet water pressure is higher than 40 PSI,the expansion tank's air pressure must be adjusted to match that pressure but must not be higher than 80 PSI.
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Most cities require that residential closed plumbing systems be equipped with expansion tanks. If you have some form of backflow preventer installed on the main water line, you may be required by law to also have a water heater expansion tank installed.
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Tankless electric water heaters do not need to be vented. Although tankless electric water heaters may output fewer GPM than a tankless gas unit, the larger electric units can provide endless hot water for up to two major applications, which is sufficient capacity for most homes.
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A water heater expansion tank is another small tank that is attached to the water supply pipe of the water heater. The expansion tank is designed to handle the thermal expansion of water as it heats up in the water heater, preventing excessive water pressure.
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Gas-burning tankless water heaters should operate for 20 years or more, two or three times longer than tank-type heaters. Tankless electric units have shorter life spans, on the order of 7 to 10 years.
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You can see that, in a typical gas system, a tankless water heater with a capacity of 199,900 BTU will require a 1-inch pipe size for a 20 ft branch length (based on the 0.3 in w.c. pressure drop in Table 2).
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Most tankless water heaters have a life expectancy of more than 20 years. They also have easily replaceable parts that extend their life by many more years. In contrast, storage water heaters last 10–15 years. Tankless water heaters can avoid the standby heat losses associated with storage water heaters.
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Continuous – Instant hot water heaters heat only the water required and because there is no storage tank (they are also known as tankless water heaters) so they do not experience heat/energy losses of storage systems. They operate on natural gas, LPG or electricity.
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Tankless water heater manufacturers recommend their units be flushed at least once a year to eliminate the buildup of calcium and other minerals within the unit -- even more often if you have hard water.
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Installing a tankless water heater outside frees up indoor space and requires no additional venting. ... Tankless water heaters can vent through the roof or a side wall, creating more flexibility and options for placement. Traditional gas tank water heater require venting through the roof.
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Tankless water heater do not have anode rods as they do not have a holding tank meaning they pair very well with soft water. ... Also in order to power an electric tankless, you need to have additional electrical work done. The power to run a standard electric water heater tank is not enough to power a tankless.
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Tankless water heaters can vent through the roof or a side wall, creating more flexibility and options for placement. Traditional gas tank water heater require venting through the roof. Tankless water heaters use fans to blow exhaust from the unit horizontally, allowing vents to terminate on the side of a house. 4.