Rinnai HDC11i LPG Conversion Kit (P11I-CONVLPG) The Rinnai HDC11i LPG Conversion Kit is the genuine, manufacturer-approved solution for converting a compatible Rinnai HDC11i water heater from natural gas to LPG (propane). It's engineered to Rinnai's own standards for safety, efficiency, and reliability, so the appliance performs to the same standard after conversion as it did on its original fuel type — including in locations where mains natural gas isn't available. Suited to domestic installations and light commercial setups, this kit includes what's needed for a proper fuel switch while maintaining correct combustion characteristics and consistent hot water performance. ⚠ Important: This conversion must be carried out by a Gas Safe registered engineer. Attempting a DIY conversion risks both safety and manufacturer compl