Tankless Water Heater Installation, Repair & Conversion

A tankless water heater heats water only when you need it, so you never run out and you stop paying to keep a full tank hot around the clock. The trade-off is that these systems are precise, and they only perform when they are sized, installed, and maintained correctly. D.M. Kelly Mechanical services all major tankless brands, gas and electric, from new installs to repairs and full tank-to-tankless conversions. If your current unit can be repaired, we will fix it. If an upgrade makes more sense, we will give you honest options and upfront pricing before any work begins.

What We Offer

• Installation: New tankless installation sized to your home's hot water demand, including gas, propane, and electric units.

• Tank-to-Tankless Conversion: Full conversion from a traditional tank, including gas line, venting, and electrical upgrades to support the new system.

• Repair: Diagnosis and repair for error codes, ignition failures, flow and temperature problems, and units that shut off mid-use.

• Descaling & Maintenance: Routine flushing and descaling to clear mineral buildup, protect efficiency, and extend the life of your unit.

• Replacement: Removal and replacement of aging or failed tankless systems with a properly sized, code-compliant unit.

Signs You Need Service

• Hot water that turns cold partway through a shower or fluctuates between hot and cold

• An error code showing on the unit's display

• Reduced flow or weak hot water at multiple fixtures at once

• The unit shutting itself off during use

• Rumbling, popping, or unusual noises from the system

• No descaling or flush in the past 12 months, especially with hard water

If any of these sound familiar, give us a call. We'll assess your system and give you a straight answer on whether to repair, descale, or replace.

Common Questions

How long does a tankless water heater last? With regular maintenance, a tankless unit typically lasts 15 to 20 years or more, nearly double the lifespan of a standard tank heater. Annual descaling is the single biggest factor in reaching that range.

Is a tankless water heater worth it? For most homes, yes. Tankless units deliver endless hot water, take up far less space, and use less energy because they are not constantly reheating a stored tank. The higher upfront cost is offset over time by lower bills and a longer lifespan.

Can you convert my tank water heater to tankless? Yes. A tank-to-tankless conversion usually involves venting, and re-routing water connections. We assess your home's setup and hot water demand, then size and install a unit that fits.

How often does a tankless unit need maintenance? Most systems should be flushed and descaled once a year, more often in homes with hard water.

Should I choose a gas or electric tankless unit? It depends on your existing utilities and hot water demand. Gas units generally support higher flow rates for larger households, while electric units work well for smaller homes and point-of-use applications. We help you weigh both during the estimate.