{
 "schema": "spawner-tool/v1",
 "id": "bot_024",
 "name": "Heizleistung berechnen kW: Rechner für Wasserstrom und Temperaturdifferenz",
 "description": "Heizleistung in kW berechnen aus Volumenstrom und Temperaturdifferenz. Der Rechner zeigt zusätzlich die elektrische Leistung bei einem wählbaren Wirkungsgrad.",
 "url": "https://fachrechner.com/de/heizleistung-berechnen-kw/",
 "spec_url": "https://fachrechner.com/de/heizleistung-berechnen-kw/spec.json",
 "language": "de",
 "market": "CH",
 "live_since": null,
 "inputs": [
  {
   "id": "volumenstrom_l_min",
   "label": "Volumenstrom Wasser",
   "unit": "l/min",
   "min": 0.1,
   "max": 500.0,
   "step": 0.1,
   "default": 10.0
  },
  {
   "id": "temperaturdifferenz_k",
   "label": "Temperaturdifferenz (Vorlauf minus Kaltwasser)",
   "unit": "K",
   "min": 0.1,
   "max": 100.0,
   "step": 0.5,
   "default": 40.0
  },
  {
   "id": "wirkungsgrad_pct",
   "label": "Wirkungsgrad des Heizgeräts",
   "unit": "%",
   "min": 1.0,
   "max": 100.0,
   "step": 1.0,
   "default": 95.0
  }
 ],
 "constants": [
  {
   "id": "cp_wasser",
   "value": 4.186,
   "source": "Spezifische Wärmekapazität von Wasser bei ca. 20 °C, Richtwert (Stoffwert)"
  },
  {
   "id": "rho_wasser",
   "value": 1,
   "source": "Dichte von Wasser bei ca. 20 °C, gerundet auf 1 kg/l (Stoffwert)"
  }
 ],
 "outputs": [
  {
   "id": "heizleistung_kw",
   "label": "Thermische Heizleistung",
   "unit": "kW",
   "decimals": 2,
   "expression": "volumenstrom_l_min * rho_wasser * cp_wasser * temperaturdifferenz_k / 60"
  },
  {
   "id": "elektrische_leistung_kw",
   "label": "Elektrische Anschlussleistung",
   "unit": "kW",
   "decimals": 2,
   "expression": "heizleistung_kw / (wirkungsgrad_pct / 100)"
  }
 ],
 "formula": "P_th [kW] = V̇ [l/min] × ρ [kg/l] × c_p [kJ/(kg·K)] × ΔT [K] / 60; P_el [kW] = P_th / η",
 "expression_language": {
  "name": "safeexpr",
  "syntax": "Python arithmetic subset: + - * / ** %, parentheses, numbers, input/constant ids and ids of earlier outputs, functions abs sqrt log log10 exp floor ceil sin cos tan min max round(x,n), constants pi e, conditionals (a if x > y else b)",
  "semantics": "% is fmod; round() rounds half away from zero; outputs are evaluated in the listed order"
 },
 "example": {
  "inputs": {
   "volumenstrom_l_min": 10.0,
   "temperaturdifferenz_k": 40.0,
   "wirkungsgrad_pct": 95.0
  },
  "outputs": {
   "heizleistung_kw": 27.91,
   "elektrische_leistung_kw": 29.38
  }
 },
 "verification": "formula checked against independent test vectors; browser JS equals the reference evaluator",
 "commercial_action": {
  "type": "product_search",
  "label": "Passende Heizgeräte finden",
  "product_category": "Heizgeräte und Durchlauferhitzer",
  "store": "eBay.ch",
  "query_template": "Durchlauferhitzer {elektrische_leistung_kw} kW",
  "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
  "example": {
   "query": "Durchlauferhitzer 29,38 kW",
   "url": "https://www.ebay.ch/sch/i.html?_nkw=Durchlauferhitzer%2029%2C38%20kW"
  },
  "bom": [
   {
    "slot": 1,
    "kind": "primary",
    "label": "Passend zum Ergebnis (Normgröße)",
    "query_template": "Durchlauferhitzer {elektrische_leistung_kw} kW",
    "standard_size_step": 0,
    "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
    "example": {
     "query": "Durchlauferhitzer 29,38 kW",
     "url": "https://www.ebay.ch/sch/i.html?_nkw=Durchlauferhitzer%2029%2C38%20kW"
    }
   },
   {
    "slot": 2,
    "kind": "accessory",
    "label": "Montagezubehör / Messgerät",
    "query_template": "Temperaturfühler Wasser Anschluss",
    "standard_size_step": 0,
    "search_url_template": "https://www.ebay.ch/sch/i.html?_nkw={q}",
    "example": {
     "query": "Temperaturfühler Wasser Anschluss",
     "url": "https://www.ebay.ch/sch/i.html?_nkw=Temperaturf%C3%BChler%20Wasser%20Anschluss"
    }
   }
  ],
  "standard_series": null,
  "affiliate": false,
  "rel": "sponsored nofollow",
  "note": "Parts list (bom) in display order. Replace {placeholders} in query_template with the user's computed values (inputs or outputs); for placeholders listed in standard_series use the smallest series value >= the computed value, then move standard_size_step positions up the series; URL-encode the query and substitute {q} in search_url_template."
 },
 "api": {
  "endpoint": "https://fachrechner.com/api/v1/calc/bot_024",
  "method": "GET",
  "parameters": "input ids as query parameters (missing = default); response JSON with outputs",
  "free_calls_per_day": 10,
  "auth": null,
  "on_limit": "HTTP 402 daily_limit_reached (no paid tier; quota resets 00:00 UTC, Retry-After)",
  "pro_checkout": null,
  "expression_tree": "https://fachrechner.com/m2m/bot_024.json"
 }
}