Lennox GWB8-075 Floor Boiler – Comfort Club Maintenance Performed full Comfort Club maintenance on the Lennox mid-efficiency GWB8-075 boiler, including detailed burner cleaning, inspection of all accessible components, and full operational diagnostics. Noted that there is no proper backflow prevention installed. The check valve inside the pressure-reducing valve does not qualify as backflow protection, and current code requires a proper backflow preventer to eliminate any possibility of boiler water entering the main potable water supply. System pressure during operation was floating around 28 psi, which is very close to the pressure relief valve’s limit. The older expansion tank is likely contributing to the elevated pressure, though the pressure-reducing valve may also be failing. Highly recommend replacing: - Expansion tank - Pressure-reducing valve - Full backflow prevention kit Estimate has been prepared and sent to the client. No other concerns noted.