Dual specialization in drain cleaning and tankless water heater repair defines Pro Drain Cleaning & Tankless Water Heater Repair at 1877 Cable Street in Ocean Beach — a narrower scope than general plumbing that concentrates tooling, descaler chemistry, and diagnostic know-how on two high-failure categories. Annual tankless flush-and-descale cycles on Navien, Rinnai, and Takagi units protect heat-exchanger coils from San Diego hard-water scale and dovetail with combustion-air verification that Casablanca Heating & Air Conditioning runs on shared B-vent flues serving both furnace and water heater. Drain work on 92107 homes frequently turns up hair-and-soap plug at trap arms on master-bathroom stacks plus grease saponification in kitchen P-traps, each with a distinct clear-out protocol. Tankless error-code diagnosis covers the ignition, flame-sensor, and flow-sensor fault classes that trigger most shutdowns between annual service intervals. When a dishwasher drain tie-in has shorted back into the sink line or an in-line appliance has failed, Giovani Appliance Repair handles the appliance-side work before the plumbing side is buttoned up. The largest project scope covers full tankless-unit replacement plus gas-line upgrade from half-inch to three-quarter-inch where original tank-heater gas supply is undersized for modern on-demand BTU draw.