Internal view

Key to components
- DHW Temperature Control
- CH Temperature Control
- Mode Indicator
- Mode Switch
- Lockout Indicator
- Burner Reset Button (12/18 and 18/25 models only)
- Flue Gas Overheat Reset Button
- Overheat Thermostat Reset Button
- Service Connection
- Pressure Gauge
- Pressure Jet Burner
- Diverter Valve
- Circulating Pump
- Auto Air Vent
- Condensate Trap Bracket
- Primary Heat Exchanger
- Heat Bank
- Heat Bank Drain-off Tap
- Flue Gas Analysis Point (behind burner)

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