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What Size Tankless Water Heater is Best? - Water Tech Advice
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WebFind many great new & used options and get the best deals for NEW Rheem 18kW Electric Tankless Water Heater 3.5 GPM RETEX-18 W at the best online prices at eBay! Free … WebApr 6, 2024 · Step 1: Calculate How Many GPM for Your Tankless Water Heater You can calculate your own maximum GPM by adding up the flow rate of each individual fixture that uses hot water in your home. This is … WebMar 10, 2024 · Max GPM (10%) According to Energy.Gov, the average water heater’s flow rate should be at least 3.25 gallons (or 12.3 liters) per minute. Each tankless water heater’s GPM (max) was evaluated ... 7g in tablespoons