Take the total GPM you need from step 3 and compare it to the one from the chart.It will tell you how many GPM the water heater will deliver at that degree rise. On the GPM chart, find the line with your degree rise from step 2.The product information page or spec sheet (downloadable on product information pages under Documents) for each of our tankless water heaters lists the gallons per minute at certain degree rises. For two showers and a load of laundry, you’ll need a water heater that’s rated to deliver at least 5.5 GPM for your area (2.0+2.0+1.5=5.5)). The gallons per minute (GPM) you and your family need at the same time will help determine the GPM your tankless water heater will need to deliver (e.g. ADD UP YOUR SIMULTANEOUS HOT WATER NEEDS.The degree rise for your area is the difference between the inlet temperature and your desired set temperature (105°-60°=45°). altitude, but not work at all at 12,000 ft. And a tankless gas water heater might work great at 8,000 ft. CALCULATE THE TEMPERATURE DEGREE RISE BASED ON YOUR LOCATIONīecause average water supply inlet temperature varies by location, the ideal tankless water heater in the south might not work at all in the north.For whole-home applications, choose the water heater type that matches your home service, either electric, natural gas or liquid propane.For a single location-like a sink, bathroom, garage or workshop-choose a point-of-use tankless electric water heater.What may ultimately help make the decision is where you need the hot water: Electric tankless water heaters don’t require venting, and because they usually only require a dedicated electrical circuit, they’re easier to install. Gas tankless water heaters are less expensive to operate, but they typically require venting-outdoor models are the notable exception. There are two basic types of tankless water heaters: gas (including both natural gas and propane (LP)) and electric (which comes in both whole-home and point-of-use configurations). To find the best tankless gas water heater or tankless electric water heater for your home, follow these four easy steps: Rheem offers the best water heaters in the business, but to enjoy endless hot water, it’s important to choose the right one.
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