{"product_id":"bonaire-sit-845-sigma-modulating-gas-valve-st0845113","title":"Bonaire SIT 845 Sigma Modulating Gas Valve","description":"\u003cdiv style=\"text-align: left;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003eThis Bonaire SIT 845 Sigma modulating gas valve is a direct replacement for your heating system, ensuring accurate gas flow for optimal performance. When a gas valve goes on the fritz, especially in the middle of winter, you know it's not just a minor inconvenience – it's a priority fix.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003eThis 24V valve is designed to keep your ducted heater running smoothly, giving you consistent warmth without the hassle of inconsistent heating cycles. It's the kind of part you need to swap out confidently, knowing your customer will be warm again quickly.\u003c\/p\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eBest For\u003c\/h2\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003e\n\u003cli\u003eHVAC service technicians replacing faulty Bonaire gas valves.\u003c\/li\u003e\n\u003cli\u003eMaintenance teams servicing ducted gas heating systems.\u003c\/li\u003e\n\u003cli\u003eCompetent DIY owners repairing their Bonaire Vulcan heaters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eCompatibility\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003eThis SIT Sigma 845 valve (SIT PN 0845113) is specifically designed as a direct replacement for Bonaire Vulcan heaters requiring part number 5440702SP. It's a 24V modulating valve, common in many residential and light commercial ducted gas heating systems. If you're running a different model, check fittings and specs before ordering.\u003c\/p\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eFeatures\u003c\/h2\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003e\n\u003cli\u003eGenuine SIT Sigma 845 modulating gas valve, ensuring reliable operation.\u003c\/li\u003e\n\u003cli\u003e24V electrical operation, compatible with standard control circuits.\u003c\/li\u003e\n\u003cli\u003eDirect replacement for Bonaire Part Number 5440702SP.\u003c\/li\u003e\n\u003cli\u003eOriginal SIT Part Number 0845113 for cross-referencing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003e\u003cli\u003e1 x Bonaire SIT 845 Sigma Modulating Gas Valve (24V)\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eUsing It on the Job\u003c\/h2\u003e\n\u003col style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolate Power:\u003c\/strong\u003e Always isolate and tag out the main power supply to the heater before starting any work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShut Off Gas:\u003c\/strong\u003e Ensure the main gas supply to the appliance is turned off at the isolation valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDepressurise System:\u003c\/strong\u003e Safely depressurise the gas lines before disconnecting the old valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect Old Valve:\u003c\/strong\u003e Carefully disconnect all electrical wiring and gas connections from the faulty valve, noting their positions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall New Valve:\u003c\/strong\u003e Mount the new valve, making all gas connections secure and leak-free, then reconnect the electrical wiring correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeak Check:\u003c\/strong\u003e Test all gas connections thoroughly with an approved leak detection solution before restoring gas supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Operation:\u003c\/strong\u003e Restore power and gas, then test the heater's function across its full modulation range to confirm proper operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003eLimitations \u0026amp; Safety Notes\u003c\/h2\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003e\n\u003cli\u003eInstallation and servicing of gas appliances must be performed by a licensed gas fitter in Australia.\u003c\/li\u003e\n\u003cli\u003eAlways isolate power and gas supply before commencing any work on the appliance.\u003c\/li\u003e\n\u003cli\u003eTest all gas connections for leaks thoroughly before returning the appliance to service.\u003c\/li\u003e\n\u003cli\u003eOnly for use with compatible Bonaire heating systems as specified by the manufacturer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote style=\"border-left: 4px solid #007acc; background-color: #f9f9f9; font-style: italic; padding: 15px; margin: 20px 0;\"\u003e\n\u003cstrong\u003eTradie Pro Tip:\u003c\/strong\u003e Before you pull the old valve out, take a quick photo of the wiring and gas connections. It's an old trick, but it saves a headache when you're trying to figure out which wire goes where, especially on a tight service call in a cramped roof space.\u003c\/blockquote\u003e\n\u003ch2 style=\"color: #007acc; border-bottom: 2px solid #f0f0f0; padding-bottom: 8px; margin-top: 35px;\"\u003ePair With\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.6; margin-bottom: 20px;\"\u003ePair with gas leak detectors and manifold gauges for safe installation, and consider a new ignitor or flame sensor if you're doing a full service on the combustion system for a complete overhaul.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Automated FAQ Schema --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What systems is this gas valve compatible with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This valve is a direct replacement for Bonaire Vulcan heaters, specifically those requiring Bonaire part number 5440702SP. It is a 24V SIT Sigma 845 modulating gas valve.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is ARCtick licensing required to install this gas valve?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No, ARCtick licensing is for refrigerant handling, not gas appliances. However, installation and servicing of gas appliances in Australia must be performed by a licensed gas fitter in accordance with local regulations and safety standards.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 'modulating' mean for this gas valve?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A modulating gas valve adjusts the gas flow incrementally to precisely control the heat output of the furnace. This allows for more efficient operation and consistent temperature control compared to a simple on\/off valve.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Bonaire","offers":[{"title":"Default Title","offer_id":43569063002171,"sku":"ST0845113","price":307.24,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0316\/7787\/4235\/files\/594_ST0845113_1.png?v=1780544283","url":"https:\/\/www.hvacshop.com.au\/products\/bonaire-sit-845-sigma-modulating-gas-valve-st0845113","provider":"HVAC Supply Shop","version":"1.0","type":"link"}