Tankless Water Heater Replacement in Brentwood, CA

A lot of Brentwood homes built in the 2000s and 2010s came with a tankless water heater, and many of those units are now 15 to 20 years old. Years of hard water take a toll on the heat exchanger, parts for older models get harder to find, and a leak from inside the cabinet usually means the unit has reached the end. Replacing a tankless heater with a new one is a different job from a first-time tankless install: the gas line, vent, and mounting point already exist, so the question is how much of that can be reused safely and to current code.

That's where replacements go right or wrong. A new unit may need a different vent type than the old one (condensing models vent through PVC or polypropylene and need a condensate drain, while older non-condensing units use stainless steel vent), and its gas and water connections may sit in different places. We check the existing gas line and meter capacity against the new unit's BTU rating, confirm the vent material and termination clearances, re-size for your household's peak GPM, and add isolation valves if the old install didn't have them, so annual descaling is a 30-minute job instead of a project.

What’s included

• Assessment of the old unit, existing gas line, vent, and condensate setup
• Peak-GPM sizing check for your current household
• Removal and recycling of the old tankless unit
• New tankless unit mounted, connected, and vented to the manufacturer's listing
• Isolation (service) valves for easy descaling
• Condensate drain and neutralizer where a condensing unit requires one
• Permit, final inspection, startup, and a homeowner walkthrough

Signs you need tankless water heater replacement

• Your tankless unit is 15+ years old and needs a major part
• Water is leaking from inside the unit's cabinet
• Error codes keep returning even after descaling and repair
• Temperature swings or shutdowns that repairs haven't fixed
• Replacement parts for your model are discontinued

What affects your price

We never quote blind. After a free on-site assessment you get one clear, upfront price — no surprises. The main factors:

• Whether the existing vent can be reused or must be replaced for the new unit's vent category
• Gas line and meter capacity for the new unit's BTU rating
• Condensing vs. non-condensing unit and any condensate drain work
• Changes to mounting location or water connections
• Whether isolation valves or a recirculation setup are added