If you have a gas water heater, plan to wait minutes for the water to get after the heater has drained its capacity. If you have an electric water heater, double that to . hours. Of course, with a tankless water heater, you never have to worry about the recovery rate..Electric Water Heater Recovery. A gallon water heater with , watt elements set to degrees takes about hour and minutes to heat water coming in to the unit at degrees. Conversely, when the water entering this same tank is degrees, it takes hours, minutes to heat it up..So if you want to know how long it will take for a water heater to come up to temp after being drained, you could use this generic number or calculate it out. BTU if watts Watts x . times recovery efficiency see AHRI screen sbelow = pounds of water heated degree..INTRODUCTION. If you use an immersion heater to heat your household water it is useful to know how long you will have to wait for the water to warm up again so that you can have a shower. In order to work this out you need to know things . The volume of water that the immersion heater tank holds..How Long Will It Take My Water Heater to Heat Up? Gas Heater. The average gas heater takes between minutes to fully heat up Electric Heater. The average electric heater takes about twice as long as Solar Heater. Because solar heaters are typi.y connected to an electric water heater, Tankless Heater. Theoreti.y, a tankless water heater .How Long Does It Take For a Water Heater to Heat Up? The Gas Water Heater. How long does it take for a water heater to heat up in the event Electric Water Heater. Generally speaking, gas water heaters tend to be cheaper Tankless Water Heater.uming you have a good tankless water heater in your hands, Solar Water Heater. The solar water heater comes .How Long Does It Take for a Gal Water Heater to Recover? Written by Herb Kirchhoff Updated June , gallon gas water heater typi.y recovers in an hour..Getting water in a shower isn’t just a matter of luck. Use this equation to figure out exactly how long it’ll take to heat up, and how much water you have left..How long does it take a new water heater to heat up? My cousin, who lives a couple of hours away, installed a new gal. electric water heater for me today. He finished the job around p.m., and I don’t have water yet at almost p.m. . Should I start worrying yet? Thanks! Susan..
Buy Camco Water Hybrid Heat Kit Easily Converts Any Gallon RV LP Gas Water Heater to V Electricity to Conserve Propane Water Heater Parts Amazon.com FREE DELIVERY possible on eligible purchases.Water heating is a heat transfer process that uses an energy source to heat water above its initial temperature. Typical domestic uses of water include co.ng, cleaning, bathing, ande heating..