What Size Water Heater Do I Need? Water Heater Size Charts
Table of Content What to Look for In a Hot Water Heater What Size Tankless Water Heater Do I Need? (Homeowners Guide) Water Heater Size Based On Number Of People In A Household How water heater tanks are measured Water Heater Size Is Important Hot Water Demand However, if your family uses more hot water than that — or you like to take long, luxurious baths — you may want to install a tankless water heater. If you determine your hot water needs using this ‘peak hour demand’ rule of thumb, you have a bit of wiggle space in the upper direction. You can add about 10% to 15% to the calculated water heater capacity. That means that you can get a 70-gallon water heater if you calculate the peak hour hot water demand to be 64 gallons. Tankless units heat water “on-demand,” instead of storing the hot water in a tank. Because they provide hot water only when you need it, tankless water heaters are generally more energy efficient than tank water heaters. The first hour rating refers speci...