📌 Key Specifications

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

🧠 What “NiTek” means (important)

NiTek is Raypak’s upgraded heat exchanger material:

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

⚠️ Important note:

• It is NOT titanium
• Water chemistry still matters a lot (pH balance is critical)

🔥 Real-world performance

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