{
  "id": "v20-ca-water-heater-sizing",
  "version": "20.16.0",
  "name": "Water Heater Storage and Recovery Calculator — Canada",
  "shortName": "Water Heater Storage and Recovery",
  "description": "Relate a specified mixed-water draw to ideal storage and recovery power using an explicit temperature balance. CAD planning view; stated limitations apply.",
  "category": "Home & Construction",
  "categorySlug": "home-construction",
  "keywords": [
    "water-heater-sizing",
    "ca",
    "quantity-surveying",
    "energy-saver",
    "engineering-scope"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/v20-ca-water-heater-sizing.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "20.16.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.",
  "urls": {
    "page": "/ca/water-heater-sizing/",
    "definition": "/ca/water-heater-sizing/definition.json",
    "schema": "/ca/water-heater-sizing/schema.json",
    "llms": "/ca/water-heater-sizing/llms.txt",
    "legacyDefinition": "/ca/water-heater-sizing/definition.json"
  },
  "queryExample": "https://askcalculators.com/ca/water-heater-sizing/?unitSystem=metric&peakLitres=150&coldTemp=10&deliveryTemp=40&storageTemp=60&recoveryHours=2&efficiency=90&unitRate=0&laborCost=0&deliveryCost=0&otherCost=0&costMultiplier=1&spreadPercent=15&taxRate=0",
  "queryParameters": {
    "unitSystem": {
      "label": "Measurement system",
      "type": "select",
      "required": false,
      "default": "metric"
    },
    "peakLitres": {
      "label": "Mixed hot-water draw in the design period",
      "type": "number",
      "required": true,
      "default": 150
    },
    "coldTemp": {
      "label": "Cold inlet temperature",
      "type": "number",
      "required": true,
      "default": 10
    },
    "deliveryTemp": {
      "label": "Required mixed delivery temperature",
      "type": "number",
      "required": true,
      "default": 40
    },
    "storageTemp": {
      "label": "Specified storage temperature",
      "type": "number",
      "required": true,
      "default": 60
    },
    "recoveryHours": {
      "label": "Allowed recovery period, hours",
      "type": "number",
      "required": true,
      "default": 2
    },
    "efficiency": {
      "label": "Recovery input-to-water efficiency",
      "type": "percent",
      "required": true,
      "default": 90
    },
    "unitRate": {
      "label": "Material price per quoted water-heater project",
      "type": "money",
      "required": true,
      "default": 0
    },
    "laborCost": {
      "label": "Total labor allowance",
      "type": "money",
      "required": true,
      "default": 0
    },
    "deliveryCost": {
      "label": "Delivery allowance",
      "type": "money",
      "required": true,
      "default": 0
    },
    "otherCost": {
      "label": "Other fixed costs",
      "type": "money",
      "required": true,
      "default": 0
    },
    "costMultiplier": {
      "label": "Material/labor multiplier",
      "type": "number",
      "required": true,
      "default": 1
    },
    "spreadPercent": {
      "label": "Low/high sensitivity around the entered total",
      "type": "percent",
      "required": true,
      "default": 15
    },
    "taxRate": {
      "label": "Explicit tax allowance",
      "type": "percent",
      "required": true,
      "default": 0
    }
  },
  "inputs": [
    {
      "id": "unitSystem",
      "label": "Measurement system",
      "type": "select",
      "defaultValue": "metric",
      "options": [
        {
          "value": "imperial",
          "label": "Imperial (US gallons / short tons where relevant)"
        },
        {
          "value": "metric",
          "label": "Metric"
        }
      ]
    },
    {
      "id": "peakLitres",
      "label": "Mixed hot-water draw in the design period",
      "type": "number",
      "defaultValue": 150,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "suffix": "L",
      "unitConversion": {
        "factor": 3.785411784,
        "offset": 0,
        "inverse": false,
        "metric": "L",
        "imperial": "US gal",
        "canonicalMin": 0,
        "canonicalMax": 1000000000000
      },
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "coldTemp",
      "label": "Cold inlet temperature",
      "type": "number",
      "defaultValue": 10,
      "required": true,
      "min": -5,
      "max": 50,
      "suffix": "°C",
      "unitConversion": {
        "factor": 0.5555555555555556,
        "offset": -17.77777777777778,
        "inverse": false,
        "metric": "°C",
        "imperial": "°F",
        "canonicalMin": -5,
        "canonicalMax": 50
      },
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "deliveryTemp",
      "label": "Required mixed delivery temperature",
      "type": "number",
      "defaultValue": 40,
      "required": true,
      "min": 0,
      "max": 80,
      "suffix": "°C",
      "unitConversion": {
        "factor": 0.5555555555555556,
        "offset": -17.77777777777778,
        "inverse": false,
        "metric": "°C",
        "imperial": "°F",
        "canonicalMin": 0,
        "canonicalMax": 80
      },
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "storageTemp",
      "label": "Specified storage temperature",
      "type": "number",
      "defaultValue": 60,
      "required": true,
      "min": 0,
      "max": 100,
      "suffix": "°C",
      "unitConversion": {
        "factor": 0.5555555555555556,
        "offset": -17.77777777777778,
        "inverse": false,
        "metric": "°C",
        "imperial": "°F",
        "canonicalMin": 0,
        "canonicalMax": 100
      },
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "recoveryHours",
      "label": "Allowed recovery period, hours",
      "type": "number",
      "defaultValue": 2,
      "required": true,
      "min": 0.01,
      "max": 48,
      "step": 0.01,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "efficiency",
      "label": "Recovery input-to-water efficiency",
      "type": "percent",
      "defaultValue": 90,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "unitRate",
      "label": "Material price per quoted water-heater project",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "help": "Zero means unpriced, not free. Enter a current, scoped supplier quote. Illustrative starting value; replace with your own evidence.",
      "prefix": "CAD"
    },
    {
      "id": "laborCost",
      "label": "Total labor allowance",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "CAD",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "CAD",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "otherCost",
      "label": "Other fixed costs",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "CAD",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "costMultiplier",
      "label": "Material/labor multiplier",
      "type": "number",
      "defaultValue": 1,
      "required": true,
      "min": 0.1,
      "max": 10,
      "step": 0.01,
      "help": "Use a verified regional index only when supplied. 1 is an unadjusted scenario, not a researched index. Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "spreadPercent",
      "label": "Low/high sensitivity around the entered total",
      "type": "percent",
      "defaultValue": 15,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "taxRate",
      "label": "Explicit tax allowance",
      "type": "percent",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    }
  ],
  "outputs": [
    {
      "id": "storedLitres",
      "label": "Ideal usable hot-water storage",
      "format": "number",
      "digits": 2,
      "unit": "litres"
    },
    {
      "id": "usefulKwh",
      "label": "Useful recovery heat, kWh",
      "format": "number",
      "digits": 2
    },
    {
      "id": "inputKw",
      "label": "Required input power, kW",
      "format": "number",
      "digits": 2
    },
    {
      "id": "materialCost",
      "label": "Material cost",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "laborCost",
      "label": "Labor allowance",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "otherCost",
      "label": "Other specified costs",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "tax",
      "label": "Entered tax allowance",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "low",
      "label": "Low cost scenario",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    },
    {
      "id": "mid",
      "label": "Middle cost scenario",
      "format": "currency",
      "digits": 2,
      "primary": true,
      "currency": "CAD"
    },
    {
      "id": "high",
      "label": "High cost scenario",
      "format": "currency",
      "digits": 2,
      "currency": "CAD"
    }
  ],
  "formula": {
    "expression": "ideal stored volume = mixed draw × (delivery − cold) ÷ (storage − cold); useful kWh = mixed litres × 4.186 × (delivery − cold)/3,600.",
    "note": "Inputs are converted to canonical units before evaluating this stated formula."
  },
  "examples": [
    {
      "label": "Illustrative defaults; required verification checks remain unconfirmed",
      "inputs": {
        "unitSystem": "metric",
        "peakLitres": 150,
        "coldTemp": 10,
        "deliveryTemp": 40,
        "storageTemp": 60,
        "recoveryHours": 2,
        "efficiency": 90,
        "unitRate": 0,
        "laborCost": 0,
        "deliveryCost": 0,
        "otherCost": 0,
        "costMultiplier": 1,
        "spreadPercent": 15,
        "taxRate": 0
      }
    }
  ],
  "sources": [
    {
      "label": "NIST unit conversion guidance",
      "url": "https://www.nist.gov/pml/special-publication-811"
    },
    {
      "label": "DOE insulation overview",
      "url": "https://www.energy.gov/energysaver/weatherize/insulation"
    }
  ],
  "publicSlug": "water-heater-sizing",
  "namespace": "ca",
  "countries": [
    "us",
    "ca",
    "uk",
    "ie"
  ]
}