[{"data":1,"prerenderedAt":754},["ShallowReactive",2],{"doc-\u002Fhardware\u002Fbuying-guide":3},{"id":4,"title":5,"body":6,"description":744,"edit":745,"extension":746,"meta":747,"navigation":748,"path":749,"seo":750,"stem":751,"vertical":745,"weight":752,"__hash__":753},"content\u002Fhardware\u002Fbuying-guide.md","Buying guide",{"type":7,"value":8,"toc":730},"minimark",[9,13,18,84,100,103,107,172,177,180,184,266,271,274,278,345,350,353,357,448,453,456,460,525,530,533,537,593,598,601,605,613,666,669,673,676,710,713,727],[10,11,12],"p",{},"A practical bill of materials for each common configuration. Prices\nare 2026-05 EU retail; multiply by 1.05 for cantons that add a\nrecycling levy. Vendor links are not affiliate links — pick the\nlocal distributor that gets to you fastest.",[14,15,17],"h2",{"id":16},"single-fridge-minimum-haccp","Single fridge — minimum HACCP",[19,20,21,40],"table",{},[22,23,24],"thead",{},[25,26,27,31,34,37],"tr",{},[28,29,30],"th",{},"Item",[28,32,33],{},"Qty",[28,35,36],{},"Unit price",[28,38,39],{},"Notes",[41,42,43,58,71],"tbody",{},[25,44,45,49,52,55],{},[46,47,48],"td",{},"Shelly H&T Gen3",[46,50,51],{},"1",[46,53,54],{},"€30",[46,56,57],{},"WiFi + battery, recommended starting point",[25,59,60,63,65,68],{},[46,61,62],{},"Velcro adhesive strips",[46,64,51],{},[46,66,67],{},"€4",[46,69,70],{},"For non-conducting mount",[25,72,73,76,78,81],{},[46,74,75],{},"Spare 18650 cell + charger",[46,77,51],{},[46,79,80],{},"€18",[46,82,83],{},"For year 2",[10,85,86,90,91,99],{},[87,88,89],"strong",{},"Total",": ~€52 + €348 (annual SaaS). ",[87,92,93,94],{},"Payback per ",[95,96,98],"a",{"href":97},"\u002Fabout\u002Froi","the ROI page",": 3.3 months.",[10,101,102],{},"Buy from: shelly.com direct, Amazon EU, Reichelt, Conrad. Avoid the\n\"Smart H&T\" listings on Aliexpress (counterfeits).",[14,104,106],{"id":105},"walk-in-fridge-freezer-small-café","Walk-in fridge + freezer (small café)",[19,108,109,121],{},[22,110,111],{},[25,112,113,115,117,119],{},[28,114,30],{},[28,116,33],{},[28,118,36],{},[28,120,39],{},[41,122,123,135,148,159],{},[25,124,125,127,130,132],{},[46,126,48],{},[46,128,129],{},"2",[46,131,54],{},[46,133,134],{},"One for walk-in, one for reach-in",[25,136,137,140,142,145],{},[46,138,139],{},"Shelly H&T Plus (USB-powered)",[46,141,51],{},[46,143,144],{},"€38",[46,146,147],{},"For freezer — USB power avoids battery freeze",[25,149,150,153,155,157],{},[46,151,152],{},"Velcro strips",[46,154,51],{},[46,156,67],{},[46,158],{},[25,160,161,164,166,169],{},[46,162,163],{},"USB-C 1 m cable + 5 V brick",[46,165,51],{},[46,167,168],{},"€10",[46,170,171],{},"For the USB-powered Shelly",[10,173,174,176],{},[87,175,89],{},": ~€110.",[10,178,179],{},"The freezer sensor is USB-powered because lithium batteries lose\ncapacity dramatically below −20 °C. A battery Shelly works in a\nfreezer for a season; then the battery dies prematurely. Drop the\nUSB cable through the door gasket or use the built-in cable port.",[14,181,183],{"id":182},"small-hotel-legionella","Small hotel (Legionella)",[19,185,186,198],{},[22,187,188],{},[25,189,190,192,194,196],{},[28,191,30],{},[28,193,33],{},[28,195,36],{},[28,197,39],{},[41,199,200,214,227,240,253],{},[25,201,202,205,208,211],{},[46,203,204],{},"Efento NS-T-3 LoRaWAN",[46,206,207],{},"4",[46,209,210],{},"€95",[46,212,213],{},"Cylinder top\u002Fbottom, supply, return",[25,215,216,219,221,224],{},[46,217,218],{},"Efento NS-T-3 external probe",[46,220,129],{},[46,222,223],{},"€30 each",[46,225,226],{},"Pipe contact mounting",[25,228,229,232,234,237],{},[46,230,231],{},"Mikrotik wAP LR8 EU868",[46,233,51],{},[46,235,236],{},"€180",[46,238,239],{},"TTN gateway",[25,241,242,245,247,250],{},[46,243,244],{},"Pipe thermal paste",[46,246,51],{},[46,248,249],{},"€12",[46,251,252],{},"For contact probes",[25,254,255,258,260,263],{},[46,256,257],{},"Pipe insulation 30 cm × 4",[46,259,51],{},[46,261,262],{},"€15",[46,264,265],{},"Over the contact probes",[10,267,268,270],{},[87,269,89],{},": ~€590 first year, ≈€348 \u002F year SaaS.",[10,272,273],{},"Set the LoRaWAN cadence to 5 minutes at install; reduce to 15 minutes\nafter verifying coverage.",[14,275,277],{"id":276},"server-room-single-rack","Server room (single rack)",[19,279,280,292],{},[22,281,282],{},[25,283,284,286,288,290],{},[28,285,30],{},[28,287,33],{},[28,289,36],{},[28,291,39],{},[41,293,294,305,318,331],{},[25,295,296,298,300,302],{},[46,297,48],{},[46,299,129],{},[46,301,54],{},[46,303,304],{},"Intake + exhaust",[25,306,307,310,312,315],{},[46,308,309],{},"Shelly Flood Gen3",[46,311,51],{},[46,313,314],{},"€25",[46,316,317],{},"Under the rack",[25,319,320,323,325,328],{},[46,321,322],{},"Shelly Door \u002F Window Gen3",[46,324,51],{},[46,326,327],{},"€20",[46,329,330],{},"(Optional) Door sensor",[25,332,333,336,339,342],{},[46,334,335],{},"USB-C bricks for sensors",[46,337,338],{},"3",[46,340,341],{},"€8",[46,343,344],{},"All USB-powered for reliability",[10,346,347,349],{},[87,348,89],{},": ~€135.",[10,351,352],{},"For an open-frame rack in a basement closet, swap the H&T sensors\nfor Efento NS-T LoRaWAN if WiFi is unreliable.",[14,354,356],{"id":355},"diy-esp32-bme280","DIY ESP32 + BME280",[19,358,359,371],{},[22,360,361],{},[25,362,363,365,367,369],{},[28,364,30],{},[28,366,33],{},[28,368,36],{},[28,370,39],{},[41,372,373,385,398,410,422,435],{},[25,374,375,378,380,382],{},[46,376,377],{},"ESP32-WROOM-32 dev board",[46,379,51],{},[46,381,67],{},[46,383,384],{},"Aliexpress \u002F Reichelt",[25,386,387,390,392,395],{},[46,388,389],{},"BME280 I²C breakout",[46,391,51],{},[46,393,394],{},"€2",[46,396,397],{},"Confirm BME280, not BMP280",[25,399,400,403,405,407],{},[46,401,402],{},"Jumper wires (40-pack)",[46,404,51],{},[46,406,394],{},[46,408,409],{},"One-time cost",[25,411,412,415,417,419],{},[46,413,414],{},"18650 holder + cell",[46,416,51],{},[46,418,67],{},[46,420,421],{},"For battery operation",[25,423,424,427,429,432],{},[46,425,426],{},"USB-C cable + 5 V brick",[46,428,51],{},[46,430,431],{},"€6",[46,433,434],{},"For mains operation",[25,436,437,440,442,445],{},[46,438,439],{},"Acrylic project box",[46,441,51],{},[46,443,444],{},"€5",[46,446,447],{},"Ventilation holes mandatory",[10,449,450,452],{},[87,451,89],{},": ~€23 per node.",[10,454,455],{},"For a school or museum installing 8+ identical sensors, DIY is\nsubstantially cheaper than commercial. The trade-off is that you are\nthe maintainer.",[14,457,459],{"id":458},"climate-school-single-classroom","Climate (school, single classroom)",[19,461,462,474],{},[22,463,464],{},[25,465,466,468,470,472],{},[28,467,30],{},[28,469,33],{},[28,471,36],{},[28,473,39],{},[41,475,476,489,501,512],{},[25,477,478,481,483,486],{},[46,479,480],{},"ESP32-S3 + Sensirion SCD41",[46,482,51],{},[46,484,485],{},"€55",[46,487,488],{},"NDIR CO₂ + T + RH",[25,490,491,494,496,498],{},[46,492,493],{},"Acrylic box with holes",[46,495,51],{},[46,497,431],{},[46,499,500],{},"Vented, no direct airflow",[25,502,503,505,507,509],{},[46,504,426],{},[46,506,51],{},[46,508,431],{},[46,510,511],{},"Mains-powered",[25,513,514,517,519,522],{},[46,515,516],{},"Wall mount adhesive",[46,518,51],{},[46,520,521],{},"€3",[46,523,524],{},"At breathing height (1.5 m)",[10,526,527,529],{},[87,528,89],{},": ~€70 per classroom.",[10,531,532],{},"Alternative: Aranet4 Home (€220) — battery, e-paper display, BLE.\nUseful when you want a wall-mounted \"traffic light\" the classroom\ncan see at a glance. OpenSense integrates via a BLE-to-WiFi gateway\n(separate device, ≈€35) or via a phone-side relay.",[14,534,536],{"id":535},"energy-single-workshop","Energy (single workshop)",[19,538,539,551],{},[22,540,541],{},[25,542,543,545,547,549],{},[28,544,30],{},[28,546,33],{},[28,548,36],{},[28,550,39],{},[41,552,553,566,580],{},[25,554,555,558,560,563],{},[46,556,557],{},"Shelly Pro 3EM (DIN rail)",[46,559,51],{},[46,561,562],{},"€140",[46,564,565],{},"Three-phase, full panel",[25,567,568,571,574,577],{},[46,569,570],{},"50 A CT clamps (×3)",[46,572,573],{},"included",[46,575,576],{},"—",[46,578,579],{},"In the box",[25,581,582,585,587,590],{},[46,583,584],{},"DIN-rail real estate (≥ 4 modules)",[46,586,51],{},[46,588,589],{},"install cost",[46,591,592],{},"Get an electrician for the panel",[10,594,595,597],{},[87,596,89],{},": ~€140 + electrician fee.",[10,599,600],{},"For a single-phase or single-appliance circuit, the Shelly Plug S\nGen3 (€20, plug-through) replaces the panel install entirely. Limited\nto 3.6 kW circuits.",[14,602,604],{"id":603},"calibration-kit-any-vertical","Calibration kit (any vertical)",[10,606,607,608,612],{},"For operators who care about traceability — see\n",[95,609,611],{"href":610},"\u002Fgetting-started\u002Fcalibration","calibration",":",[19,614,615,625],{},[22,616,617],{},[25,618,619,621,623],{},[28,620,30],{},[28,622,33],{},[28,624,36],{},[41,626,627,637,647,656],{},[25,628,629,632,634],{},[46,630,631],{},"Fluke 1551A Stik thermometer",[46,633,51],{},[46,635,636],{},"€700",[25,638,639,642,644],{},[46,640,641],{},"ISO 17025 cert (annual)",[46,643,51],{},[46,645,646],{},"€120 \u002F yr",[25,648,649,652,654],{},[46,650,651],{},"Insulated ice-bath flask",[46,653,51],{},[46,655,314],{},[25,657,658,661,663],{},[46,659,660],{},"Two-point calibration spreadsheet",[46,662,576],{},[46,664,665],{},"free (template on request)",[10,667,668],{},"Optional unless you are pharmacy-grade.",[14,670,672],{"id":671},"where-to-buy","Where to buy",[10,674,675],{},"EU vendors that ship to small businesses without hassle:",[677,678,679,686,692,698,704],"ul",{},[680,681,682,685],"li",{},[87,683,684],{},"shelly.com"," — direct, fast EU shipping.",[680,687,688,691],{},[87,689,690],{},"Reichelt"," (DE) — wide selection, includes Efento, ESP32, BME280.",[680,693,694,697],{},[87,695,696],{},"Conrad"," (DE\u002FAT\u002FCH\u002FCZ\u002FSK) — slightly pricier but local depots in\nmost EU capitals.",[680,699,700,703],{},[87,701,702],{},"Distrelec"," (CH\u002FAT\u002FDE) — for industrial-grade Efento and PT100.",[680,705,706,709],{},[87,707,708],{},"Amazon EU"," — fast for Shelly, careful with the no-name listings.",[10,711,712],{},"For Slovak buyers specifically:",[677,714,715,721],{},[680,716,717,720],{},[87,718,719],{},"TIPA.eu"," — Slovak distributor with quick Bratislava delivery.",[680,722,723,726],{},[87,724,725],{},"Hadex.cz"," — Czech, ships SK same week.",[10,728,729],{},"We will ship a small starter kit (3 × Shelly H&T + USB bricks + a\nQR-coded onboarding card) to Slovak pilot customers at cost. Email\nus before the first month if you want one.",{"title":731,"searchDepth":732,"depth":732,"links":733},"",3,[734,736,737,738,739,740,741,742,743],{"id":16,"depth":735,"text":17},2,{"id":105,"depth":735,"text":106},{"id":182,"depth":735,"text":183},{"id":276,"depth":735,"text":277},{"id":355,"depth":735,"text":356},{"id":458,"depth":735,"text":459},{"id":535,"depth":735,"text":536},{"id":603,"depth":735,"text":604},{"id":671,"depth":735,"text":672},"What to actually order, and from where",null,"md",{},true,"\u002Fhardware\u002Fbuying-guide",{"title":5,"description":744},"hardware\u002Fbuying-guide",105,"boCxg2wzrQD6YP8dHcKbeOd7DnidDsWd9Rcw0lLcKd8",1779022953599]