{"product_id":"raypak-model-r404a-avia®-pool-spa-heater-natural-gas-399-mbtuh-120-240v-018045","title":"Raypak Model R404A Avia® Pool \u0026 Spa Heater Natural Gas 399 MBTUH 120\/240V 018045","description":"\u003cdiv\u003e\n  \u003ch2\u003eRaypak 018045 P-R404A-EN-N AVIA HD with NiTek Natural Gas Heater 399K BTU\u003c\/h2\u003e\n\n  \u003cp\u003eThe Raypak 018045 P-R404A-EN-N AVIA® HD with NiTek Pool and Spa Heater is a 404A-series natural gas heater designed for efficient residential pool and spa heating. This 399K BTU class heater features Raypak’s AVIA smart control platform, built-in Wi-Fi enabled control, Raymote™ app compatibility, and a NiTek heat exchanger for enhanced durability in demanding pool environments.\u003c\/p\u003e\n\n  \u003cp\u003eThis model is commonly used on residential pools and spas where a 399 MBTU\/h natural gas heater with AVIA controls, NiTek exchanger technology, and 120\/240VAC electrical capability is required. Always confirm gas type, model number, altitude, plumbing, venting, electrical requirements, local code, and heater sizing before ordering.\u003c\/p\u003e\n\n  \u003ch3\u003eProduct Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eGenuine Raypak AVIA® HD pool and spa heater\u003c\/li\u003e\n    \u003cli\u003eManufacturer part number: 018045\u003c\/li\u003e\n    \u003cli\u003eModel: P-R404A-EN-N \/ R404A\u003c\/li\u003e\n    \u003cli\u003e399 MBTU\/h natural gas heater\u003c\/li\u003e\n    \u003cli\u003eNiTek heat exchanger for enhanced erosion and corrosion resistance\u003c\/li\u003e\n    \u003cli\u003eBuilt-in Wi-Fi enabled control system\u003c\/li\u003e\n    \u003cli\u003eCompatible with Raypak Raymote™ app control where supported\u003c\/li\u003e\n    \u003cli\u003eDigital control system with onboard heater management\u003c\/li\u003e\n    \u003cli\u003eIndoor and outdoor installation capability where approved and properly vented\u003c\/li\u003e\n    \u003cli\u003eCategory I and Category III venting capability where specified\u003c\/li\u003e\n    \u003cli\u003e120\/240VAC single-phase electrical compatibility\u003c\/li\u003e\n    \u003cli\u003eDesigned for up to 100 GPM max water flow where specified\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eProduct Details\u003c\/h3\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eRaypak\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e018045\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eP-R404A-EN-N \/ R404A\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eProduct Line\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eAVIA® HD with NiTek\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eGas Pool and Spa Heater\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eFuel Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eNatural Gas\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eHeater Size\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e404A \/ 399 MBTU\/h class\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eThermal Efficiency\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e84% where specified\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eHeat Exchanger\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eNiTek\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eControl Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eAVIA Digital Wi-Fi Enabled Control\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e120\/240VAC where specified\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eVenting\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCategory I and Category III where specified\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eMax Water Flow\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e100 GPM where specified\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eElevation Range\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e0 to 10,000 ft where specified\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eUnit Weight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e135 lbs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e155 lbs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eResidential pool and spa heating\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eResidential pool and spa systems requiring a Raypak P-R404A-EN-N natural gas AVIA heater\u003c\/li\u003e\n    \u003cli\u003eApplications requiring a 399 MBTU\/h natural gas pool and spa heater\u003c\/li\u003e\n    \u003cli\u003eSystems where AVIA digital control and Raymote™ app compatibility are desired\u003c\/li\u003e\n    \u003cli\u003eInstallations where NiTek exchanger construction is preferred for added durability\u003c\/li\u003e\n    \u003cli\u003eIndoor or outdoor installations only when installed according to Raypak instructions and local code\u003c\/li\u003e\n    \u003cli\u003eEquipment pads where gas supply, water flow, venting, electrical supply, and clearances meet Raypak requirements\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Uses\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eHeating residential swimming pools\u003c\/li\u003e\n    \u003cli\u003eHeating attached spas when properly sized and plumbed\u003c\/li\u003e\n    \u003cli\u003eReplacing a compatible Raypak AVIA 404A natural gas heater\u003c\/li\u003e\n    \u003cli\u003eUpgrading to a smart Wi-Fi enabled Raypak heater platform\u003c\/li\u003e\n    \u003cli\u003ePool systems where a NiTek heat exchanger is preferred over standard copper or cupro-nickel construction\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eImportant Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThis item is the heater only.\u003c\/li\u003e\n    \u003cli\u003eGas line, electrical wiring, bonding, venting, unions, plumbing fittings, automation wiring, check valves, external bypass plumbing when required, pressure relief valve where required, indoor vent components, and installation materials are sold separately unless otherwise stated.\u003c\/li\u003e\n    \u003cli\u003eThis model is natural gas only. Do not use propane unless the exact propane model is ordered.\u003c\/li\u003e\n    \u003cli\u003eVerify model number P-R404A-EN-N and part number 018045 before ordering.\u003c\/li\u003e\n    \u003cli\u003eVerify natural gas availability, gas line sizing, elevation requirements, venting category, clearances, and local code before installation.\u003c\/li\u003e\n    \u003cli\u003eThis AVIA HD with NiTek model is not the same as standard Raypak Digital copper, cupro-nickel, ASME, propane, or older atmospheric heater models.\u003c\/li\u003e\n    \u003cli\u003eWi-Fi and Raymote™ features require proper setup, compatible network conditions, and supported app\/device configuration.\u003c\/li\u003e\n    \u003cli\u003eSome jurisdictions require specific Low NOx, emissions, venting, or efficiency requirements. Confirm local requirements before purchase or installation.\u003c\/li\u003e\n    \u003cli\u003eImproper water chemistry, low flow, scale, corrosive water, freeze damage, or improper bypass settings can damage the heater and heat exchanger.\u003c\/li\u003e\n    \u003cli\u003eGas heater installation and service should be performed by a qualified pool heater professional according to Raypak instructions and local code.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eConfirm the model, fuel type, BTU size, heat exchanger type, voltage, venting requirements, and local code requirements before installation.\u003c\/li\u003e\n    \u003cli\u003eInstall the heater on a level, non-combustible equipment pad with proper service access and clearances.\u003c\/li\u003e\n    \u003cli\u003eSize the natural gas line according to the heater demand, run length, gas type, and local code.\u003c\/li\u003e\n    \u003cli\u003eConfirm proper water flow through the heater before firing.\u003c\/li\u003e\n    \u003cli\u003eUse proper plumbing practices and install any required check valves to protect the heater from chemical backflow.\u003c\/li\u003e\n    \u003cli\u003eInstall an external bypass when required by the system design or Raypak installation guidance.\u003c\/li\u003e\n    \u003cli\u003eBond and wire the heater according to the installation manual and applicable electrical code.\u003c\/li\u003e\n    \u003cli\u003eVerify inlet\/outlet plumbing orientation before startup.\u003c\/li\u003e\n    \u003cli\u003eSet up Wi-Fi and Raymote™ control only after the heater has been safely installed and commissioned.\u003c\/li\u003e\n    \u003cli\u003eCheck for gas leaks, water leaks, proper ignition, proper flow, and correct temperature operation during startup.\u003c\/li\u003e\n    \u003cli\u003eRegister the heater and keep installation records, serial number, and startup documentation for warranty and service reference.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypak-model-r404a-avia%C2%AE-pool-spa-heater-natural-gas-399-mbtuh-120-240v-018045\"\u003eRaypak 018045 R404A AVIA® Natural Gas Heater\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypakpoolheaterdrainplugkit006721fray006721f\"\u003eRaypak 006721F Pool Heater Drain Plug Kit\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypakprotekshieldassembly399kbtu017960fray017960f\"\u003eRaypak 017960F ProTek Shield Assembly, 399K BTU\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypak2cpvcconnectornutkit006723fray006723f\"\u003eRaypak 006723F 2\" CPVC Connector \u0026amp; Nut Kit\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypak175psipressureswitchray006737fray006737f\"\u003eRaypak 006737F 1.75 PSI Pressure Switch\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypak120240v24vtransformer006736fray006736f\"\u003eRaypak 006736F 120\/240V to 24V Transformer\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypakpr406aenc51digitalnaturalgasheater399kbtuelectronicignitionpolymerheaderscopperexchanger260lbs009223ray009223\"\u003eRaypak 009223 P-R406A-EN-C #51 Digital Natural Gas Heater\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypakpr406aenx51digitalnaturalgasheater360kbtucupronickelexchanger260lbsprotekshieldmodule014941ray014941\"\u003eRaypak 014941 P-R406A-EN-X #51 Digital Natural Gas Heater\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/products\/raypak-406a-digital-natural-gas-asme-heater-017374\"\u003eRaypak 017374 406A Digital Natural Gas ASME Heater\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMaintain proper pool water chemistry to help protect the NiTek heat exchanger.\u003c\/li\u003e\n    \u003cli\u003eKeep pH, alkalinity, calcium hardness, and sanitizer within recommended ranges.\u003c\/li\u003e\n    \u003cli\u003eClean the pool filter regularly to maintain proper heater flow.\u003c\/li\u003e\n    \u003cli\u003eInspect the heater area for leaves, debris, rodents, insects, and restricted airflow.\u003c\/li\u003e\n    \u003cli\u003eCheck the equipment pad for water leaks, gas odor, rust, or signs of overheating.\u003c\/li\u003e\n    \u003cli\u003eKeep Wi-Fi credentials and app access updated if using Raymote™ features.\u003c\/li\u003e\n    \u003cli\u003eWinterize the heater properly in freeze-prone conditions.\u003c\/li\u003e\n    \u003cli\u003eHave ignition, gas pressure, flame quality, venting, safety controls, water flow, and heat exchanger condition checked by a qualified heater technician during routine service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Raypak","offers":[{"title":"Default Title","offer_id":52880866804028,"sku":"018045","price":4923.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/RAY-15-0066_medium_fc117b44-ea7a-46c2-86c5-77ead1f6d8b9.jpg?v=1773687120","url":"https:\/\/aquapoolsupply.com\/products\/raypak-model-r404a-avia%c2%ae-pool-spa-heater-natural-gas-399-mbtuh-120-240v-018045","provider":"Aqua Pool Supply","version":"1.0","type":"link"}