After about a minute, the pump shuts off and you get hot water seconds after opening the tap. Tankless units with digital connectivity let you adjust the temperature and monitor gas and hot-water usage on your phone. More important, the unit can identify the source of a problem. Relay that information to your plumber and he or she can show up knowing exactly what needs to be done. It takes a big burst of BTUs for a tankless heater to turn cold water into hot water in just a few seconds. To find the actual gpm of a fixture, time how many seconds it takes to fill a bucket to a 1-quart mark.
Dividing 15 by that number of seconds equals gpm. Homes without a gas line or propane tank can also enjoy the advantages of on-demand hot water by installing tankless units powered by electricity. These units, which heat water with thick copper rods, are quieter and about a third smaller than gas or propane tankless heaters. One drawback to electric units is its limited output, which tops out at 36 kilowatts, or about , Btus. Whichever type you choose, it will need sufficient amperage at the main panel and heavy-gauge wires.
Also, electric heaters last only about half as long as gas units: Typical warranties are three to five years. Once the heating elements fry, it usually costs about as much to replace the entire heater as it does to swap in new elements. For the burner in a tankless heater to perform properly, it has to be hooked up to a gas-supply line that delivers enough volume at sufficient pressure. And if the pressure falls short, the gas company will have to adjust the regulator on the meter.
Noncondensing tankless gas heaters use stainless-steel vents that can withstand high exhaust heat. Condensing units have a cooler exhaust, and use less expensive PVC pipes. A concentric vent, which has an exhaust pipe inside a larger air-intake pipe, simplifies installation because only one hole needs to be cut in the wall. However, there can be issues or complications with them outside routine maintenance. Any homeowner that finds any of the above issues regularly occurring should contact a professional plumber who can easily assess the problem and discuss the best solution with the homeowner.
Disclosure: BobVila. You agree that BobVila. All rights reserved. Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. Major Systems Solved! Do you have a tankless water heater in your home? Or are you considering one and wondering, how does a tankless water heater work?
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When you have a tank water heater, only 60 cents of that dollar is used to heat water. The rest goes down the drain! Have you dreamed of what you would do if you had more space in your garage or your home? A typical water heater is about two feet wide and five feet tall. A tankless water heater, however, is only about 16 inches wide, 26 inches long, and 6 inches deep. Goodbye, giant tank—hello, new laundry room! Some people hesitate to decide on a tankless water heater because they can be a slightly higher cost; however, you get significantly more life out of one.
A standard water heater tank lasts about years. A tankless water heater can last as long as 25 years! Tankless heats on demand, so it always pulls fresh water. Even though the unit uses only a minute amount of power, it requires at least some in order to get started.
The downside? If you have no power, you have no hot water. A tankless water heater does have a higher upfront cost compared to your usual water heaters. And many offer extended, comprehensive warranties. Accessories like room motion sensors and push-button water demand are available to help make hot water instantly available when it's needed.
Waiting for hot water can be frustrating, costly, and wasteful. Recirculating technology eliminates the wait, so hot water is always at the ready. Our technology permits this even if your home does not have a dedicated return line.
Your water heater is the most important appliance in your home. Choosing tankless is the smart investment. Answer a series of simple questions about your home and our Solution Selector will show you exactly what Rinnai system you need to improve your life and home. Tankless water heating system installs require a specific knowledge and highly trained skill set you can only get from a professional.
Be sure to protect your investment by having your tankless system installed by a certified Rinnai PRO.
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