[{"data":1,"prerenderedAt":669},["ShallowReactive",2],{"post-en-pool-heat-pump-power-calculator":3},{"post":4,"i18nParams":662},{"id":5,"title":6,"author":7,"body":8,"dateModified":7,"datePublished":7,"description":653,"disableFeedback":654,"extension":655,"image":7,"meta":656,"navigation":657,"ogType":7,"path":658,"seo":659,"stem":660,"translationKey":12,"__hash__":661},"en\u002Fen\u002Fpool\u002Fheat-pump-power-calculator.md","Pool heat pump power calculator",null,{"type":9,"value":10,"toc":643},"minimark",[11,14,523,552],[12,13],"pool-heat-pump-calculator",{},[15,16,19,24,37,59,63,66,77,95,105,133,140,144,192,197,200,308,313,317,343,346,352,370,385,389,392,449,459,473,483,487,490,520],"content-section",{"icon":17,"title":18},"i-lucide-book-open","How it works & methodology",[20,21,23],"h3",{"id":22},"how-this-calculator-works","How this calculator works",[25,26,27,28,32,33,36],"p",{},"This calculator gives you an instant, personalised estimate of the power your pool's\nheat pump needs, with every step shown so you can check it yourself. We start from how much water your\npool holds, multiply it by a ",[29,30,31],"strong",{},"climate number"," for your region, then nudge that up or\ndown for the things that make a pool lose or keep heat. The answer is a ",[29,34,35],{},"power range","\nrather than a single figure: any pump inside it will heat your pool well, and a bigger\none simply heats it a little faster. Use it as a confident starting point to compare\nmodels and quotes — it complements, rather than replaces, an installer's on-site survey.",[25,38,39,42,43,47,48,51,52,47,55,58],{},[29,40,41],{},"Two quick terms."," ",[44,45,46],"em",{},"kW"," is ",[29,49,50],{},"power"," — how fast the pump delivers heat, and the\nnumber this tool gives you. ",[44,53,54],{},"kWh",[29,56,57],{},"energy"," — power used over time, i.e. what shows\nup on your electricity bill.",[20,60,62],{"id":61},"the-formula-behind-the-result","The formula behind the result",[25,64,65],{},"Here is the exact calculation — nothing is hidden:",[67,68,73],"pre",{"className":69,"code":71,"language":72},[70],"language-text","rawPower = volume\n         × climateCoeff[zone]     \u002F\u002F 0.18 \u002F 0.15 \u002F 0.12   ← the core\n         × coverFactor[cover]     \u002F\u002F is it covered?\n         × enclosureFactor[abri]  \u002F\u002F is it under a shelter?\n         × typeFactor[poolType]   \u002F\u002F in-ground or above-ground?\n         × tempFactor[targetTemp] \u002F\u002F how warm you want the water\n         × windFactor[wind]       \u002F\u002F how exposed it is\n         × seasonFactor[season]   \u002F\u002F summer \u002F standard \u002F year-round\n\npower = max(3.5, rawPower)         \u002F\u002F never below the smallest real pump\n","text",[74,75,71],"code",{"__ignoreMap":76},"",[25,78,79,80,83,84,87,88,91,92,94],{},"The square-bracket notation just means \"pick the value for your case\":\n",[74,81,82],{},"climateCoeff[zone]"," is the climate number for ",[44,85,86],{},"your"," zone, ",[74,89,90],{},"coverFactor[cover]"," is the\nfactor for ",[44,93,86],{}," cover, and so on.",[25,96,97,100,101,104],{},[29,98,99],{},"The core"," is the first line: ",[74,102,103],{},"volume × climateCoeff[zone]",". This is the\nstandard volume-based sizing method used by installers, and on its own it already lands within about\n10–15 % of what an installer would quote [1][2]. A bigger pool, or a colder climate\nzone, means more power — nothing more complicated than that.",[25,106,107,110,111,114,115,118,119,122,123,118,126,129,130,132],{},[29,108,109],{},"The adjustments"," are everything that follows. Each one is a simple multiplier:\nit equals ",[29,112,113],{},"1.0"," for a \"typical\" pool, sits ",[29,116,117],{},"above 1.0"," when it ",[44,120,121],{},"raises"," the power\nneeded, and ",[29,124,125],{},"below 1.0",[44,127,128],{},"lowers"," it. They exist because no two pools lose\nheat the same way — a covered, sheltered pool in mild air behaves very differently\nfrom an exposed, uncovered one. By capturing the real heat drivers (cover, shelter,\nexposure, target temperature, pool type), the adjustments turn a generic estimate\ninto one that fits ",[44,131,86],{}," pool. That is what makes the recommended range tight and\nrealistic instead of a one-size-fits-all guess.",[25,134,135,136,139],{},"Finally, ",[74,137,138],{},"max(3.5, …)"," simply means we never recommend a pump smaller than the\nsmallest model that actually exists.",[20,141,143],{"id":142},"the-factors-in-plain-language","The factors, in plain language",[145,146,147,154,160,166,176,182],"ul",{},[148,149,150,153],"li",{},[29,151,152],{},"How much water (volume)."," More water means more to heat, so this is the starting\npoint — that is why we ask for length, width and depth.",[148,155,156,159],{},[29,157,158],{},"Where you live (climate)."," Colder regions lose heat faster and need more power.\nYou just enter your postal code and we convert it into France's official climate\nzone [3], so you never have to guess.",[148,161,162,165],{},[29,163,164],{},"A cover."," The single biggest lever: evaporation is a pool's number-one source of\nheat loss, so a cover dramatically cuts the power you need.",[148,167,168,171,172,175],{},[29,169,170],{},"Shelter and wind."," An enclosure (a pool shelter or \"abri\") traps heat and lowers\nthe power needed; an exposed, windy spot speeds up evaporation and raises it — and a\n",[44,173,174],{},"very"," exposed spot (seaside, plateau, open plain) raises it more.",[148,177,178,181],{},[29,179,180],{},"Your target temperature."," Every extra degree costs power — that is why aiming for\n28 °C needs more than a comfortable 26 °C.",[148,183,184,187,188,191],{},[29,185,186],{},"Your heating period (season)."," Heating only in summer means mild air and lower\npower; stretching the season into colder air needs more power ",[44,189,190],{},"and"," costs more to run\n(the pump also loses efficiency as the air cools). Year-round use in cold air assumes\na pool enclosure — without one, a standard air\u002Fwater pump can't keep up.",[193,194,196],"h4",{"id":195},"at-a-glance-what-raises-or-lowers-your-power","At a glance: what raises or lowers your power",[25,198,199],{},"Starting from a \"typical\" pool (covered most of the time, in-ground, open air, 26 °C),\neach choice moves the power up or down:",[201,202,203,216],"table",{},[204,205,206],"thead",{},[207,208,209,213],"tr",{},[210,211,212],"th",{},"Your situation",[210,214,215],{},"Effect on power",[217,218,219,230,240,248,258,268,278,288,298],"tbody",{},[207,220,221,225],{},[222,223,224],"td",{},"No cover",[222,226,227],{},[29,228,229],{},"+30 %",[207,231,232,235],{},[222,233,234],{},"Cover at night only",[222,236,237],{},[29,238,239],{},"+15 %",[207,241,242,245],{},[222,243,244],{},"Cover most of the time",[222,246,247],{},"reference (no change)",[207,249,250,253],{},[222,251,252],{},"Roller shutter \u002F isothermic cover",[222,254,255],{},[29,256,257],{},"−8 %",[207,259,260,263],{},[222,261,262],{},"Shelter \u002F enclosure: low \"abri\" → high \"abri\" → indoor",[222,264,265],{},[29,266,267],{},"−15 % → −30 % → −40 %",[207,269,270,273],{},[222,271,272],{},"Above-ground (vs in-ground)",[222,274,275],{},[29,276,277],{},"+10 %",[207,279,280,283],{},[222,281,282],{},"Warmer water, 28 °C \u002F 30 °C",[222,284,285],{},[29,286,287],{},"+12 % \u002F +25 %",[207,289,290,293],{},[222,291,292],{},"Sheltered \u002F exposed \u002F very exposed spot",[222,294,295],{},[29,296,297],{},"−8 % \u002F +10 % \u002F +20 %",[207,299,300,303],{},[222,301,302],{},"Heating period: summer \u002F standard \u002F year-round",[222,304,305],{},[29,306,307],{},"−15 % \u002F reference \u002F +40 %",[25,309,310],{},[44,311,312],{},"These percentages are our own calibrated estimates (see the references note at the\nend); each is \"no change\" for the typical pool above.",[20,314,316],{"id":315},"a-worked-example-you-can-try","A worked example you can try",[318,319,320],"blockquote",{},[25,321,322,323,326,327,330,331,334,335,338,339,342],{},"Choose the ",[29,324,325],{},"\"8 × 4 m\" standard pool"," preset (an 8 × 4 × 1.5 m in-ground pool, which\nholds ",[29,328,329],{},"48 m³"," of water). Enter postal code ",[29,332,333],{},"33000 (Bordeaux — climate zone H2)",",\nleave the cover on ",[29,336,337],{},"\"at night\"",", and set the target temperature to ",[29,340,341],{},"28 °C",".",[25,344,345],{},"Dropped into the formula, that gives:",[67,347,350],{"className":348,"code":349,"language":72},[70],"rawPower = 48 (m³) × 0.15 (H2) × 1.15 (cover at night) × 1.0 (no shelter)\n                   × 1.0 (in-ground) × 1.12 (28 °C) × 1.0 (moderate wind)\n                   × 1.0 (standard season)\n         ≈ 9.27 kW   →   recommended range 9.5 – 11.5 kW\n",[74,351,349],{"__ignoreMap":76},[25,353,354,357,358,361,362,365,366,369],{},[29,355,356],{},"How does 9.27 kW become a 9.5 – 11.5 kW range?"," We round the target to the nearest\nhalf-kilowatt (→ ",[29,359,360],{},"9.5 kW",", the sensible minimum), then add up to ",[29,363,364],{},"+25 % headroom","\n(→ ",[29,367,368],{},"11.5 kW",") so the pump still heats comfortably in cooler weather. Any pump inside\nthat band suits this pool; a bigger one just warms the water faster.",[25,371,372,373,376,377,380,381,384],{},"Here the climate coefficient ",[29,374,375],{},"0.15"," is our calibrated value for temperate zone H2;\nit is consistent with the published per-region power charts [2] once you account for\nour covered-pool baseline (see the honesty note below). The cover (",[29,378,379],{},"1.15",") and\ntemperature (",[29,382,383],{},"1.12",") factors are likewise our own calibrated estimates.",[20,386,388],{"id":387},"where-our-numbers-come-from","Where our numbers come from",[25,390,391],{},"These are not made-up figures:",[145,393,394,420,427,434],{},[148,395,396,397,400,401,404,405,407,408,411,412,415,416,419],{},"The ",[29,398,399],{},"\"volume × climate\" method"," is the standard volume-based sizing method used by installers [1]. The\nspecific coefficients (about ",[29,402,403],{},"0.18"," in cold zone H1, ",[29,406,375],{}," in temperate H2,\n",[29,409,410],{},"0.12"," on the Mediterranean H3) are ",[29,413,414],{},"our own calibrated values"," — no single guide\npublishes that exact set. They line up with independent per-region power charts [2]\nonce you allow for the fact that our coefficients assume a ",[44,417,418],{},"covered"," pool (uncover it,\nand our 0.12 \u002F 0.15 \u002F 0.18 rise to about 0.16 \u002F 0.20 \u002F 0.23 kW\u002Fm³, within the published\nper-region range).",[148,421,422,423,426],{},"The climate zones are ",[29,424,425],{},"France's official RT2012 zones",", defined by Météo-France [3].",[148,428,429,430,433],{},"The heat-up time relies on a basic physics constant: it takes ",[29,431,432],{},"1.163 watt-hours to\nwarm one litre of water by one degree"," [1].",[148,435,436,437,440,441,444,445,448],{},"The running-cost estimate uses a typical electricity price [5] and a typical pump\nefficiency, or ",[29,438,439],{},"COP"," [4] — and you can adjust both in the advanced options. Your\n",[29,442,443],{},"heating period"," also moves the bill: a longer season means more hours running and\na lower average COP as the air cools, so a year-round setting costs noticeably more\nthan a summer one. (Cost figures current as of ",[29,446,447],{},"June 2026",", when the regulated base\nrate was about 0.19–0.20 €\u002FkWh; set your own tariff for an exact bill.)",[25,450,451,454,455,458],{},[29,452,453],{},"In all honesty:"," a few of the fine-tuning percentages (for example the exact effect\nof a cover, a shelter, wind exposure or the heating-period setting) are our own\ncalibrated estimates, and we say so openly. Overall the result is accurate to about ",[29,456,457],{},"±15 %"," — the same spread you would\nget between two professional quotes. That is exactly why we give you a range and not a\nsingle \"perfect\" number.",[25,460,461,464,465,468,469,472],{},[29,462,463],{},"We test it."," The model is locked by an automated check against independent reference\ncases. For example, for an 80 m³ pool near Rennes our recommended ",[29,466,467],{},"17 – 21.5 kW","\nband brackets an independent professional configurator's ",[29,470,471],{},"17.4 kW","; small cold-climate\nand covered Mediterranean pools pass the same check, each landing within the tool's\n±15 % accuracy. If a coefficient ever changed, that test would flag it.",[25,474,475,478,479,482],{},[29,476,477],{},"Independent by design:"," the power is worked out first, purely from your pool's\ncharacteristics. Any product suggestions are matched to that result ",[44,480,481],{},"afterwards"," — the\nsizing is never influenced by what is for sale.",[20,484,486],{"id":485},"when-to-double-check-with-a-professional","When to double-check with a professional",[25,488,489],{},"This calculator is a reliable starting point for a typical outdoor home pool. Ask an\ninstaller for a tailored quote when:",[145,491,492,499,506,513],{},[148,493,494,495,498],{},"your pool is ",[29,496,497],{},"indoor"," — a very different heat-loss profile (the tool flags this\nresult as indicative);",[148,500,501,502,505],{},"you want to heat ",[29,503,504],{},"year-round in cold air"," — a standard air\u002Fwater pump drops out\nbelow about 5 °C, so this case really needs a pool enclosure (the tool flags it);",[148,507,508,509,512],{},"it is ",[29,510,511],{},"very large or an unusual shape"," — the model assumes a roughly rectangular\npool;",[148,514,515,516,519],{},"it sits in an ",[29,517,518],{},"extreme spot"," — high altitude, very exposed, or a strong local\nmicro-climate that a department-level climate zone cannot capture.",[25,521,522],{},"In those cases, use the range as a sanity check rather than the final word.",[15,524,527,540,546],{"icon":525,"title":526},"i-lucide-circle-help","Common questions",[25,528,529,532,533,536,537,539],{},[29,530,531],{},"What heat-pump power does my pool need?","\nAs a rule of thumb, take your pool's volume in m³ and multiply by a climate coefficient\n(0.18 in cold zone H1, 0.15 in temperate H2, 0.12 on the Mediterranean H3), then adjust\nfor cover, shelter, pool type, target temperature and wind. Those coefficients are our\nown ",[29,534,535],{},"calibrated values",": they follow the same direction as professional per-region\nsizing charts [2] — the colder the zone, the more power — and while the exact numbers\ndiffer from any single chart, the full calculation lands in the same recommended power\nrange (we check this against independent references; see ",[44,538,388],{},").\nThe calculator does all of this and shows a range rather than one value.",[25,541,542,545],{},[29,543,544],{},"Should I oversize my pool heat pump?","\nA margin of about +25 % above the target power is healthy: it speeds up the temperature\nrise and keeps performance up in cooler weather. That is why the result is shown as a\nrange, from the bare minimum up to that margin.",[25,547,548,551],{},[29,549,550],{},"Does a cover really change the power needed?","\nYes — it is the single biggest factor, because evaporation is a pool's number-one heat\nloss. The baseline already assumes a cover; without one, the power required rises\nnoticeably.",[15,553,556,621],{"icon":554,"title":555},"i-lucide-link","References",[557,558,559,572,583,603,614],"ol",{},[148,560,561,562,565,566],{},"Cash Piscines — ",[44,563,564],{},"Le guide ultime pour dimensionner votre pompe à chaleur de piscine","\n(the field-standard volume-based sizing method, its aggravating factors for cover and\nwind, and the 1.163 Wh\u002FL·°C water-heating constant — it uses a ΔT-based formula, not a\nper-zone coefficient table). ",[567,568,569],"a",{"href":569,"rel":570},"https:\u002F\u002Fwww.cash-piscines.com\u002Fconseils\u002Farticle\u002Fle-guide-ultime-pour-dimensionner-correctement-votre-pompe-a-chaleur-de-piscine",[571],"nofollow",[148,573,574,575,578,579],{},"Aqua Jardin — ",[44,576,577],{},"Pompe à chaleur piscine 50 m³ : quelle puissance ?"," (independent\nrecommended power by climate region, used to cross-check the coefficients).\n",[567,580,581],{"href":581,"rel":582},"https:\u002F\u002Faqua-jardin.fr\u002Fcomparatifs\u002Fpompe-chaleur-piscine-50m3\u002F",[571],[148,584,585,586,589,590,594,595,598,599],{},"Ministère de la Transition écologique — ",[44,587,588],{},"Répartition des départements par zone\nclimatique"," (the official government classification of French departments into climate\nzones H1\u002FH2\u002FH3, defined by Météo-France for the RT2012\u002FRE2020 regulations).\n",[567,591,592],{"href":592,"rel":593},"https:\u002F\u002Fwww.ecologie.gouv.fr\u002Fsites\u002Fdefault\u002Ffiles\u002Fdocuments\u002FLa%20r%C3%A9partition%20des%20d%C3%A9partements%20par%20zone%20climatique.pdf",[571],"\nPlain-language overview: Hellowatt — ",[44,596,597],{},"Zone climatique France : définition, carte et\nimpact",". ",[567,600,601],{"href":601,"rel":602},"https:\u002F\u002Fwww.hellowatt.fr\u002Frenovation\u002Fglobale\u002Fzone-climatique",[571],[148,604,605,606,609,610],{},"Guide-piscine.fr — ",[44,607,608],{},"Qu'est-ce que le COP d'une pompe à chaleur de piscine ?"," (a pool\nheat pump's coefficient of performance: should not be below ~3.5, typically around 4).\n",[567,611,612],{"href":612,"rel":613},"https:\u002F\u002Fwww.guide-piscine.fr\u002Fpompe-a-chaleur\u002Fqu-est-ce-que-le-cop-d-une-pompe-a-chaleur-de-piscine-5457_A",[571],[148,615,616,617],{},"Fournisseurs-Électricité \u002F EDF Tarif Bleu — regulated electricity price per kWh\n(Base option), used as the default running-cost rate.\n",[567,618,619],{"href":619,"rel":620},"https:\u002F\u002Fwww.fournisseurs-electricite.com\u002Ffournisseurs\u002Fedf\u002Ftarifs\u002Fbase",[571],[25,622,623,626,627,630,631,634,635,638,639,642],{},[44,624,625],{},"Note on the coefficients and factors:"," the volume × climate ",[29,628,629],{},"method"," is\nfield-standard [1], and our per-zone coefficients are ",[29,632,633],{},"consistent with"," published\nper-region power figures [2] once normalised for our covered-pool baseline. But the\nexact ",[74,636,637],{},"0.18 \u002F 0.15 \u002F 0.12"," triplet, and the fine-tuning cover, shelter, wind, per-degree\ntemperature and heating-period (season) factors, are ",[29,640,641],{},"calibrated in-house estimates"," —\nno single public source prints those exact values. We present them as engineering estimates, which is why the\ntool's output is a range accurate to roughly ±15 % rather than a single guaranteed\nfigure.",{"title":76,"searchDepth":644,"depth":644,"links":645},2,[646,648,649,650,651,652],{"id":22,"depth":647,"text":23},3,{"id":61,"depth":647,"text":62},{"id":142,"depth":647,"text":143},{"id":315,"depth":647,"text":316},{"id":387,"depth":647,"text":388},{"id":485,"depth":647,"text":486},"Size your pool heat pump for free in 5 questions. Instant personalised result, no sign-up.",false,"md",{},true,"\u002Fen\u002Fpool\u002Fheat-pump-power-calculator",{"title":6,"description":653},"en\u002Fpool\u002Fheat-pump-power-calculator","fu4B4srLqGJ93eSAr9HT65lPmjd9U3KtBOztmPUQU0A",{"en":663,"fr":666},{"category":664,"slug":665},"pool","heat-pump-power-calculator",{"category":667,"slug":668},"piscine","calculateur-pompe-chaleur-piscine",1785097050093]