📌 Key Specifications

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• 🔥 BTU Output: 399,000 BTU (high-capacity class)
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• ⚙️ Model: 018045 / AVIA HD 404A
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• ⛽ Fuel type: Natural Gas
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• 📶 Smart control: Built-in WiFi (Raymote app)
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• 🧱 Heat exchanger: NiTek (high corrosion resistance alloy)
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• 🌡️ Efficiency: ~84% thermal efficiency
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• 💧 Max flow: ~100–125 GPM depending on configuration
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• 🏊 Pool size range: ~up to 40,000 gallons typical use
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• ⚡ Power: 120/240V (controls only, gas does heating)
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• 🏗️ Install type: Indoor or outdoor, vented system
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🧠 What “NiTek” means (important)

NiTek is Raypak’s upgraded heat exchanger material:

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• 🛡️ ~3× more erosion resistant than copper
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• 🧪 Better resistance to pool chemicals and scaling
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• 💧 Designed for longer life in harsh water conditions
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⚠️ Important note:

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• It is NOT titanium
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• Water chemistry still matters a lot (pH balance is critical)
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🔥 Real-world performance

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• 🌡️ Heats pool very fast (gas heater advantage)
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• ⏱️ Typical rise:\n
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  • ~2–5°F per hour depending on pool size and conditions
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• ❄️ Works well even in cooler weather (unlike heat pumps)
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• 🏊 Best for:\n
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  • Spas
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  • Medium–large pools
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  • Quick heating before use
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