{"uid":"cap_K8-jvsOHY-xYh9j6EPIi_","slug":"home-energy-calculators-water-heater-recovery-cost-1a6e319e","name":"Home Energy Calculators – Water Heater Recovery & Cost","description":"Water heater recovery rate (gallons an hour), tank heat-up time and energy cost from input power, efficiency and rise.","url":"https://home-energy-calc.x402tookit.com/water-heater?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["fuel","inputPower","riseF"],"properties":{"fuel":{"type":"string","description":"electric, gas (natural gas), propane or oil"},"riseF":{"type":"number","description":"Temperature rise in F (hot setpoint minus cold inlet), 10 to 120; for 50 F to 120 F use 70"},"efficiency":{"type":"number","description":"Recovery efficiency 0.3 to 1 (default 0.98 electric, 0.78 gas and propane, 0.80 oil)"},"inputPower":{"type":"number","description":"Heating input: kW for electric (for example 4.5), BTU/h for gas, propane or oil (for example 40000)"},"pricePerKwh":{"type":"number","description":"Electricity price per kWh (electric)"},"tankGallons":{"type":"number","description":"Tank size in gallons, for heat-up time and cost"},"pricePerTherm":{"type":"number","description":"Gas price per therm (gas)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"fuel":{"type":["null","string"]},"riseF":{"type":["null","number"]},"source":{"type":["null","string"]},"formula":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"disclaimer":{"type":["null","string"]},"efficiency":{"type":["null","number"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"heatUpHours":{"type":["null","number"]},"tankGallons":{"type":["null","number"]},"heatUpMinutes":{"type":["null","number"]},"inputBtuPerHour":{"type":["null","number"]},"costPerTankHeating":{"type":["null","number"]},"energyToHeatTankBtu":{"type":["null","number"]},"energyToHeatTankKwh":{"type":["null","number"]},"recoveryLitresPerHour":{"type":["null","number"]},"recoveryGallonsPerHour":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_lueEB9SMyG1Bsx8_W7NYH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates water heater recovery rate (gallons per hour), tank heat-up time, and energy cost from fuel type, input power, efficiency, and temperature rise.","exampleAgentPrompt":"My electric water heater has a 4.5 kW element and 0.95 efficiency — how many gallons per hour can it recover with a 70°F temperature rise, and how long would it take to fully reheat a 50-gallon tank if electricity costs $0.13 per kWh?","exampleUseCases":[{"title":"New water heater sizing check","prompt":"I'm buying a 50-gallon natural gas water heater with 40,000 BTU/h input and 0.78 efficiency. The cold water comes in at 55°F and I want 120°F hot water — how many gallons per hour will it recover and how long does it take to fully heat from cold?"},{"title":"Monthly water heating cost estimate","prompt":"We have an 80-gallon electric water heater with a 5.5 kW heating element at 0.98 efficiency and a 70°F temperature rise. Electricity costs us $0.15 per kWh — what's the cost to heat a full tank from scratch?"},{"title":"Comparing propane vs electric recovery speed","prompt":"Our propane water heater puts out 36,000 BTU/h with 0.78 efficiency and a 65°F rise. How many gallons per hour does it recover, and how long to reheat a 40-gallon tank? Propane costs $1.80 per therm."}],"resultDescription":"Returns recovery rate in gallons per hour, heat-up time in hours and minutes, energy required in BTU, cost per tank heating in dollars, the fuel type, efficiency used, temperature rise, and a plain-language summary with the underlying formula and any applicable disclaimers.","failureModes":["Missing required parameters (fuel, inputPower, riseF) returns a validation error","Out-of-range riseF (outside 10–120°F) may produce an error or warning","Invalid fuel type string (not electric/gas/propane/oil) returns an error","Extremely low inputPower values may produce unrealistic recovery rates","Missing pricePerKwh or pricePerTherm when cost calculation is expected results in no cost output"],"whenToPreferThis":"Choose this endpoint when you need precise, formula-driven water heater recovery rate, heat-up time, or per-tank energy cost calculations for any fuel type (electric, gas, propane, oil). It is ideal for home energy audits, appliance comparison, and estimating operating costs from known heater specs. Prefer it over general-purpose calculators when you need structured numeric outputs and a plain-language summary with the underlying formula.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:30:14.528Z","isFirstParty":false,"canonicalSlug":"home-energy-calculators-water-heater-recovery-cost-1a6e319e"}