Commercial Water Heater Repair, Replacement & Installation

Hot water is essential for daily operations in commercial facilities. When a water heater fails, it can disrupt business, affect sanitation, and create compliance concerns. D.M. Kelly Mechanical provides professional commercial water heater service for offices, medical facilities, restaurants, schools, industrial spaces, and multi‑unit properties. We work with all major brands and system types, including traditional tank water heaters, high‑capacity tankless systems, and commercial hybrid models. If repairs are viable, we’ll restore performance. If replacement is needed, we’ll guide you through efficient, cost‑effective options with clear, upfront pricing.

What We Offer

• Commercial Water Heater Repair — Diagnosis and repair of all gas, electric, and tankless systems 8 years old or newer. Addressing leaks, pressure issues, inconsistent temperatures, system faults, and recovery problems

• Commercial Water Heater Replacement — Complete removal and installation when systems reach end of life or no longer meet demand. Equipment properly sized for capacity, usage, and efficiency

• Tankless Water Heater Installation — High‑efficiency, on‑demand hot water solutions ideal for facilities with continuous or variable usage

• Combi‑Boiler Systems — Installation, replacement, and service for commercial combination boilers that provide both space heating and domestic hot water from a single, high‑efficiency system. Ideal for facilities looking to save space, reduce energy usage, and simplify equipment maintenance. We handle system sizing, integration, controls, and code compliance to ensure reliable performance under commercial demand.

• Preventive Maintenance — Scheduled flushing, anode inspections, temperature and pressure valve testing, and system performance checks to reduce downtime and extend equipment life

• Multi‑Unit & Facility Support — Water heater service and installation for restaurants, offices, warehouses, healthcare buildings, and multi‑tenant properties

Signs You Need Service

• Insufficient or inconsistent hot water throughout the facility

• Water heaters not keeping up with demand

• Rumbling, popping, or banging noises from tanks

• Rust‑colored or discolored hot water

• Leaks around the tank, piping, or fittings

• Extended recovery times between usage cycles

• Units nearing or exceeding expected service life

If you’re experiencing any of these issues, prompt service can help prevent operational disruptions and costly emergency failures. Our team will assess your system and provide clear recommendations to repair or replace as needed.

Common Questions

How long do commercial water heaters last? Commercial tank water heaters typically last 8–15 years depending on usage, water quality, and maintenance. Tankless systems often last 15–20 years or more with proper care and service.

Should we repair or replace a commercial water heater? If repair costs exceed half the price of replacement and the system is near the end of its expected lifespan, replacement is usually the more reliable and cost‑effective option. We’ll always present both options.

Are tankless water heaters a good choice for commercial buildings? Yes, especially for facilities with frequent hot water demand. Tankless systems offer energy savings, longer lifespan, and unlimited hot water when properly sized.

How do you size a commercial water heater? Sizing is based on peak demand, fixture count, usage patterns, and facility type. We perform a detailed assessment to ensure proper capacity and code compliance.

How long does commercial water heater installation take? Standard replacements can often be completed in a single day. More complex tankless systems or installations requiring gas, electrical, or venting upgrades may take longer. Timelines are discussed in advance.