Most residential tankless natural gas water heaters will cost between $500 and $1,500. For example, if you have very little space, selecting a small, energy-efficient water heater may mean you have to go with a noisier model. When selecting a water heater, you can usually prioritize two of these options. Generally for a water heater to be more energy efficient (which will reduce operating costs and save you money), it needs to be larger and/or louder. Once you have determined the necessary BTU output and flow rates for your home, the next step to determining the best tankless water heater for your needs will come down to the energy efficiency, the size of the water heater and the noise level.
If the fixture’s gpm is unknown, you can time how long it takes to fill a bucket to 1-quart of hot water.
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The fixtures in your home that need hot water will each have a flow rate in gpm, commonly listed in the manual or on a label on the fixture. the groundwater temperature averages between 42 degrees Fahrenheit to 52 degrees Fahrenheit, needing 550 to 650 BTUs per gallon. In the southern United States, the temperature of the groundwater averages between 62 degrees Fahrenheit to 72 degrees Fahrenheit needing 400 to 500 BTUs per gallon to raise the temperature 120 degrees Fahrenheit, while in the central to northern U.S. The formula is: BTU per gallon to raise groundwater 120 degrees Fahrenheit x peak hot-water demand (gpm) x 60 minutes ÷ UEF (uniform energy factor) = BTU output. With that information you can use a simple formula to determine your needed BTU output. To calculate the necessary BTU output for your home you should consider three factors: the temperature of groundwater, the peak demand for hot water and the uniform energy factor of the water heater. When selecting a natural gas tankless hot water heater, you need to make sure the flow rate and BTU are appropriate for the size of your home, where you live and the amount of hot water you use. Best Gas Tankless Water Heaters Of June 2023 While we work hard to provide accurate and up to date information that we think you will find relevant, Forbes Home does not and cannot guarantee that any information provided is complete and makes no representations or warranties in connection thereto, nor to the accuracy or applicability thereof. The compensation we receive from advertisers does not influence the recommendations or advice our editorial team provides in our articles or otherwise impact any of the editorial content on Forbes Home. Second, we also include links to advertisers’ offers in some of our articles these “affiliate links” may generate income for our site when you click on them. This site does not include all companies or products available within the market. The compensation we receive for those placements affects how and where advertisers’ offers appear on the site. First, we provide paid placements to advertisers to present their offers. This compensation comes from two main sources.
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