Water heater installation and replacement

Replace it when the tank leaks, when a major repair is needed on a unit near 10+ years old, or when it can't keep up with demand. Rust in the hot water and heavy rumbling are signs it's close.

In most jurisdictions, including Mecklenburg County, yes. A permit means the installation is inspected for venting, relief valve and gas safety.

For tank heaters, households of 1–2 people often use 30–40 gallons and 3–4 people 40–50 gallons, adjusted for tubs, simultaneous showers and fuel type. Tankless units are sized by flow rate in gallons per minute rather than capacity.

Usually, yes, if your home has a closed plumbing system — for example a check valve or pressure-reducing valve at the main. Current codes often require one so thermal expansion doesn't strain the heater and relief valve.

Yes, if gas service is available and a gas line and proper venting can be run to the location. The switch adds gas piping and venting work to the installation.

National cost guides put a standard tank replacement at roughly $1,200 to $2,500 installed; Fixr lists about $1,900 on average for gas. Tankless and heat pump installations often run $2,000 to $4,500 or more. These are national estimates, not quotes.

Under the Department of Energy's 2024 rule, most electric storage water heaters over 35 gallons manufactured from May 6, 2029 will need heat pump technology. Heaters installed before then aren't affected.

North Carolina code requires an expansion device when a storage heater is installed or replaced on a supply with a check valve, pressure-reducing valve or backflow preventer, and the relief-valve discharge must be piped so it can't cause damage.