export type WaterHeaterBTUInput = {
    /**
     * Storage tank capacity in gallons
     */
    tank_gallons: number;
    /**
     * Output temp minus inlet
     */
    temp_rise_f?: number;
    /**
     * Hours to heat full tank
     */
    recovery_time_hr?: number;
    fuel?: 'natural_gas' | 'propane' | 'electric' | 'oil';
};
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