Replacing a water heater: tank, tankless or heat pump?
Updated 2026-10-20
Most tank water heaters last 8–12 years. When yours goes, you'll choose between another tank, a tankless unit or an electric heat pump water heater, and a proper install includes a permit and earthquake strapping.
Signs it's time
- Water around the base of the tank (a leaking tank can't be repaired)
- Rusty or discolored hot water
- Popping or rumbling noises
- Running out of hot water faster than before
- The tank is more than 10–12 years old (the date is in the serial number on the label)
Your three options
- Tank (gas or electric): the simplest swap and usually the lowest upfront cost.
- Tankless (gas): endless hot water and saves space, but may need a bigger gas line and new venting.
- Heat pump water heater (electric): very efficient and often eligible for rebates; needs some space around it and may need a new electrical circuit.
What a proper install includes
- A city permit and inspection
- Earthquake straps: California requires water heaters to be braced or strapped
- Correct venting for gas units and a working temperature/pressure relief valve
- An expansion tank where required
- Haul-away of the old tank
Questions to ask the plumber
- Is the permit included?
- What size do you recommend for my household, and why?
- How long are the tank and labor warrantied?
- Are there rebates for a heat pump water heater right now?
Ready for a plumber?
Send one request with photos. A person at SVHN reads it and sends it to one local pro. Free for homeowners.
Questions
My water heater is leaking. What should I do now?
Turn off the cold-water valve on top of the tank, turn off the gas or the breaker, and put a pan or towels down. Then send a plumbing request and choose the fastest timing.
Sources
General information, not legal advice. Rules change; check with your city or the agency linked above.