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White electric water heater featuring Mountain Man Plumbing badge, Salt Lake City installation.","caption":"","credit":"","reuse_instructions":"","approved_for_agent_interface":true,"source_page_url":"https://mtnmanplumbing.com/past-work-salt-lake-city-electric-water-heater/","source_title":"Salt Lake City Electric Water Heater Installation | Mountain Man Plumbing | Mountain Man Plumbing"}],"warnings":[{"code":"input","message":"Input values and interactive results are not represented; connect the public data provider."},{"code":"iframe","message":"Embedded or interactive media may carry information absent from HTML text."},{"code":"non-http-link","message":"A script, data, or unsupported link was omitted; its label was retained."},{"code":"audio","message":"Embedded or interactive media may carry information absent from HTML text."}],"markdown":"Hours:  Sun 8 AM-7 PM \\| Mon 8 AM-7 PM \\| Tue 8 AM-7 PM \\| Wed 8 AM-7 PM \\| Thu 8 AM-7 PM \\| Fri 8 AM-7 PM \\| Sat 8 AM-7 PM\n\n [Skip 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heater will keep up with your house?\n\nTank gallons tell you how much is stored. Recovery tells you how fast the heater makes more.\n\nSize for the busiest normal hour at your house.\n\n[See what size will keep up](<https://mtnmanplumbing.com/water-heater-sizing/#what-changes>)\n\n![Electric water heater installed in a constrained Salt Lake City closet](<https://mtnmanplumbing.com/wp-content/uploads/2026/05/salt-lake-city-electric-water-heater-before.png>)\n\nSalt Lake City field photo · Demand, space, connections, and available power all matter\n\nThe sizing rule\n\n## Start with the busiest hour.\n\nTwo back-to-back showers are different from two showers, laundry, and a dishwasher all at once. For a tank, we compare that busy hour with the first-hour rating. For tankless, we add the flow and Utah’s winter temperature rise. Copy the old size only if it already kept up.\n\nTry your real routine\n\n## What runs before the hot water turns cold?\n\nYour normal morning is a better sizing test than the number of bedrooms.\n\n### What runs at the same time?\n\nA morning with two showers and a load of laundry tells us more than the total number of people in the house.\n\n### How does the old heater fall short?\n\nTell us when it runs out, how long recovery takes, and whether the problem has always been there.\n\n### What will fit the house?\n\nFuel capacity, venting, electrical service, condensate or drain access, clearances, and available space can rule options in or out.\n\nField note · Salt Lake City\n\n## Capacity is only one part of fit.\n\nThis closet shows why room matters. Before choosing a replacement, measure the space, check the connections and leave room to service the heater.\n\n![Electric water heater in a constrained Salt Lake City closet](<https://mtnmanplumbing.com/wp-content/uploads/2026/05/salt-lake-city-electric-water-heater-before.png>)\n\nRoom for the tank is only the start. Check service access, drains, piping and power too.\n\nTankless water heater installed in West Jordan\n\nTankless adds flow, temperature rise, gas supply, venting, and maintenance access to the sizing problem.\n\nThe numbers that matter\n\n## Why two 50-gallon heaters can perform differently.\n\n### First-hour rating\n\nThis tested rating combines stored hot water and recovery. It is the useful quick comparison between storage heaters.\n\n### Recovery rate\n\nRecovery is how quickly the heater replaces the hot water you used. Two same-size tanks can recover at very different rates.\n\n### Fixtures running together\n\nTankless sizing is based on the shower, tub, sink, dishwasher, and laundry that may overlap. Record which fixtures run together and their flow rates.\n\n### Temperature rise\n\nTankless flow ratings change with incoming-water temperature. The colder the incoming water, the fewer gallons per minute the heater can deliver at shower temperature.\n\nWork through an example\n\n## Size the demand. *Then check the equipment.*\n\nTry a hot-water example\n\n### How much water needs heating?\n\nA shower mixes hot water from the heater with cold water. Its total flow is different from the flow through the heater.\n\n Incoming cold water  35–80°F · degrees Fahrenheit  Water leaving the heater  100–140°F  Mixed water at the fixture  80–120°F  Total flow at fixtures used together  0.1–20 US gallons/minute (GPM)\n\nTry different numbers here to see how mixing works. Do not use the calculator to choose a hotter setting on your heater; that also changes the risk of scalding.\n\nWater drawn from the heater\n\n**3.66  GPM**\n\nAt an 80°F rise, about 81% of the mixed flow comes from the heater.\n\nOrange: heated water · Blue: cold water mixed in\n\nAbout 146,250 BTU/h must reach the water.\n\nNavien lists 4.9 GPM at an 80°F rise for the NPE-240S2. This example uses less hot water than that published flow. Include all fixtures that run together when comparing a heater.\n\n### Show the calculation\n\nHot fraction = (105 − 40) ÷ (120 − 40) = 0.8125. Hot flow = 4.5 × 0.8125 = 3.66 GPM.\n\nHeat delivered to the water ≈ 500 × hot GPM × temperature rise, in BTU/h. The 500 combines water’s approximate weight, heat capacity and minutes per hour. Fuel input also has to account for the heater’s efficiency, and distribution piping loses additional heat.\n\nWorked example: two 2.0-GPM showers and a 0.5-GPM faucet, all mixed to 105°F. Measure your own fixtures and winter inlet temperature when planning a job. The model comparison appears only when your temperature rise matches a published point.\n\n [ENERGY STAR: mixing valves and stored hot water ↗](<https://www.energystar.gov/partner-resources/residential_new/educational_resources/sup_program_guidance/heat_pump_water_heater_guide/installation_best_practices>)[Navien NPE-240S2: published flow table and dimensions ↗](<https://www.navieninc.com/products/npe-240s2>)\n\n### A trickle can be too little for tankless.\n\nA tankless heater also needs enough water moving through it to start. Turning up its temperature makes a shower mix in more cold water, so less water passes through the heater. At a low draw, that can make heating stop. Check the model’s minimum starting flow before blaming a sensor.\n\n### A tank has a reserve and a refill rate.\n\n**Recovery** is the speed at which the heater makes more hot water. **First-hour rating** combines a fully heated starting tank with heating during the test. Compare published ratings under the same test conditions.\n\n**Illustrative comparison**\n\nFor this example, imagine two 50-gallon tanks with first-hour ratings of 65 and 85 gallons. The second supplies 20 more gallons during that hour. The rating accounts for how the stored supply is used and how much water is reheated. A large tub filled all at once also needs enough stored hot water to cover that initial draw.\n\n### Technician reasoning: distinguish lost capacity from undersizing\n\nRecord outlet temperature, draw rate and recovery with the equipment fully heated, using its manufacturer’s draw-test procedure. A unit that used to handle the same routine may have lost output. A new demand pattern can exceed a healthy unit. Compare those possibilities before specifying extra capacity.\n\n [ENERGY STAR: first-hour rating and energy ratings ↗](<https://www.energystar.gov/products/water_heaters/residential_water_heaters_key_product_criteria>)\n\n### Where these explanations come from\n\nRead the manufacturer and technical references behind this lesson. For service settings, open the manual for your full model number.\n\n- [ENERGY STAR: first-hour rating and energy ratings ↗](<https://www.energystar.gov/products/water_heaters/residential_water_heaters_key_product_criteria>)\n- [Navien NPE-240S2: published flow table and dimensions ↗](<https://www.navieninc.com/products/npe-240s2>)\n- [ENERGY STAR: mixing valves and stored hot water ↗](<https://www.energystar.gov/partner-resources/residential_new/educational_resources/sup_program_guidance/heat_pump_water_heater_guide/installation_best_practices>)\n\nRecent work, real homes\n\n## See this work in the field.\n\nOpen a job to see the equipment, the problem, and the finished work.\n\nNorth Salt Lake Bradford White Water Heater Swap in North Salt Lake\n\nNorth Salt Lake\n\nField log\n\n### [North Salt Lake Bradford White Water Heater Swap](<https://mtnmanplumbing.com/past-work-north-salt-lake-bradford-white-water-heater-swap/?agentnet=md>)\n\n**Open the job →**\n\nDowntown Condo Bradford White Swap and Floor Drain Clear in Salt Lake City\n\nSalt Lake City\n\nField log\n\n### [Downtown Condo Bradford White Swap and Floor Drain Clear](<https://mtnmanplumbing.com/past-work-downtown-condo-bradford-white-swap-and-floor-drain-clear/?agentnet=md>)\n\n**Open the job →**\n\n [See all recent water-heater work →](<https://mtnmanplumbing.com/past-work/?agentnet=md>)\n\nCommon questions\n\n## The questions that keep the next shower hot.\n\n### How many gallons does my family need?\n\nGallons alone cannot answer it. We compare the busiest hour with the heater’s first-hour rating and recovery, then make sure the equipment fits the house.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-sizing/#answer-how-many-gallons-does-my-family-need>)\n\n### Is a larger tank always better?\n\nNo. A larger tank takes more room and may still recover slowly. Sometimes a better-performing tank of the same size is the smarter fix.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-sizing/#answer-is-a-larger-tank-always-better>)\n\n### How is tankless sizing different?\n\nWe add the fixtures that may run together and calculate how much the heater must warm the incoming water. Both numbers change the answer.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-sizing/#answer-how-is-tankless-sizing-different>)\n\nRelated water-heater guides\n\n## Check these before you choose the replacement.\n\n- [**Repair or replace** See when a repair is worth making and when replacement is the better use of your money.](<https://mtnmanplumbing.com/water-heater-repair-or-replace/?agentnet=md>)\n\n- [**Utah gas-heater rules** Check the address, fuel and exact model before buying a natural-gas water heater in Utah.](<https://mtnmanplumbing.com/utah-low-nox-water-heater/?agentnet=md>)\n\n [Back to the complete water-heater guide →](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n\nTired of the cold finish?\n\n## Size the new heater around your real routine.\n\nTell us what runs together and when the old heater falls short. We’ll check the demand and the room before recommending equipment.\n\n### Exclusive Offers\n\n  ● Active Specials\n\nMountain Man Plumbing deals and offers\n\nConnected in your home\n\n## Keep following the plumbing.\n\n- [01 **Water heater repair & learning hub →** Compare the tank and tankless equipment being sized.](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n- [02 **Gas pressure & pipe sizing →** A higher-output gas heater may need a supply review.](<https://mtnmanplumbing.com/gas-line-installation/gas-pressure-and-sizing/?agentnet=md>)\n- [03 **Shower & tub plumbing →** Multiple outlets and a large tub change hot-water demand.](<https://mtnmanplumbing.com/services/shower-tub/?agentnet=md>)\n\n[Skip to Footer](<https://mtnmanplumbing.com/water-heater-sizing/#mmp-footer>)\n\nMountain Man Plumbing  Sandy, Utah · Salt Lake Valley\n\n[Mountain Man Plumbing logo](<https://mtnmanplumbing.com/?agentnet=md>)\n\nYour local plumber\n\n## Let’s get it fixed.\n\nStrong values. 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