does a tankless water heater need a thermal expansion tank?
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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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A unvented system has a pressure/expansion vessel, which is a vessel with a diaphragm, as above the diaphragm allows for expansion. A system boiler unlike a combi has stored hot water - for larger properties - or where a few taps could be used at a time therefore a combi flow rate wouldn't suffice.
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How Much Can I Expect to Pay? Average price for a tankless hot water heater ranges from $1000 – $2,800. Tankless water heaters are often a bit more complex to install and generally require additional piping around the unit. Be sure to factor in the installation cost in addition to the initial cost of the unit.
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One whole-house tankless water heater has four 7,000-watt elements, for a total electrical load of 28,000 watts. This load re- quires wire and a circuit breaker that will handle at least 120 amps, at a cost many times that of electrical service to a conventional tank water heater.
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All tankless water heaters should have a sediment filter installed on their incoming water line. These filters will protect your unit from unexpected debris entering your tankless. They are inexpensive and easy to maintain and well worth the investment.
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A tankless water heater requires a 4-foot clearance from the side or below a door or window that opens, unless the unit is directly vented to the outside. If the water heater is installed above the door or window, it needs 12 inches of clearance.
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For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%–34% more energy efficient than conventional storage tank water heaters. ... 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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A new tankless water heater costs between $2,500 and $4,500 installed, while a whole house tank costs between $600 and $800. A tankless hot water heater costs around $430 without installation and a traditional heater costs around $440.
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Installation of a tankless water heater is NOT considered a "do-it-yourself" project. However, the installation of a Stiebel Eltron electric tankless water heater is relatively simple and can be done by any licenced plumber and electrician.
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Architects and engineers understand that when a tankless water heater reaches the end of its life it will likely leak, just like a tank. Even though the leak is substantially less than a tank, containing the water and conveying it safely away can save thousands of dollars in property damage.
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The credit amount for Gas, Oil, Propane Water Heaters, including tankless units, is $300. That means if you installed a qualifying tankless water heater last year, you could get the credit on the return you file in 2020 (for 2019). ... “Water Heaters (non-solar)” are a part of Residential Energy Property Costs.
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In general, tankless water heaters are safer than storage tank water heaters. ... Because there is no tank which can overheat or experience a massive spike in pressure, a tankless system doesn't have the danger of bursting or exploding. A tankless system is also a safer device to have with children around.
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Tankless water heaters heat water directly without the use of a storage tank. When a hot water tap is turned on, cold water travels through a pipe into the unit. Either a gas burner or an electric element heats the water. ... Gas-fired tankless water heaters produce higher flow rates than electric ones.
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Placing the new tankless water heater shouldn't last more than half an hour. The plumber has to bring the new unit, take it out of the box and handle it for the later mount. Connecting the system may take somewhere between 45 and 60 minutes.
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Tankless water heaters heat water directly without the use of a storage tank. ... Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water.
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Unlike traditional water heaters, where tanks store water and maintain the water's temperature until someone turns on the tap or the washing machine, tankless heaters only heat the water when an actual demand is made. No tap on, no water being heated. One difference between tankless water heaters vs.
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We don't make an electric model, because there are several potential drawbacks to electric tankless water heater units. Based on national averages, electricity costs nearly twice as much per BTU as natural gas. ...