Start with the type of heater
| Type | Upfront cost level | What else to plan for |
|---|---|---|
| Standard gas tank | Lower | Vent, gas shutoff, combustion air, straps |
| Standard electric tank | Lower | Circuit capacity, drain pan |
| Tankless gas | Higher | Larger gas line, sealed vent, condensate drain |
| Heat pump hybrid | Higher | Space for air flow, condensate drain, noise |
A tank swap in the same spot is the simplest case. Moving the heater, changing fuel or going tankless adds work that can exceed the cost of the unit. Our water heater replacement page covers the urgent case, and the tankless page covers sizing.
The line items inside an installation quote
- The heater itself, sized for your household.
- New water connectors and a cold water shutoff.
- A temperature and pressure relief valve and a drain pipe to a safe termination point.
- Seismic strapping.
- A gas shutoff valve and flexible connector, or an electrical disconnect.
- Venting work on gas units.
- Permit and inspection fees.
- Haul-away of the old tank.
Ask which of these are in your quote. A very low number often leaves out straps, the permit or the haul-away, and you pay for them later.
California safety items that add real parts
The City of Martinez publishes a water heater handout that cites California Plumbing Code items inspectors check. It calls for two seismic straps on a tank, plus a third on tanks over 52 gallons. It calls for a relief valve drain that ends 6 to 24 inches above the ground, and a gas shutoff valve beside the unit.
It also notes that gas burners must sit at least 18 inches above the floor in a garage unless the unit is rated otherwise. These items are not upsells. They are what an inspector looks for, and a quote that skips them is incomplete.
Where the surprises come from
Old vent runs
A vent without proper rise or clearance has to be corrected.
Corroded shutoffs
Old valves can break when touched and need replacing.
Tight closets and attics
Access adds labor and sometimes a drain pan and drain line.
Higher capacity needs
A bigger unit may need a larger gas line or breaker.
Repair or replace: the cost lens
If your tank is young and only a part failed, a repair costs less than a new tank. If the tank is leaking through the shell, repair is not possible. Our water heater repair page explains the diagnosis. Many tanks near the end of life fail soon after a repair, so we price both side by side.
Rebates and incentives
Some heat pump and high-efficiency units qualify for utility or state incentives. Programs change, so check the current offers before you buy, and keep your receipts and paperwork. We do not promise any rebate.
Questions to ask before you accept a quote
- What capacity are you quoting, and why that size for my household?
- Does the price include a new relief valve, drain pipe and seismic straps?
- Is the permit included, and who schedules the inspection?
- What happens to the old tank?
- Is there a warranty on the unit and a separate one on the labor?
- What would change the price after you open the space?
A good plumber answers each in plain words. If the answers are vague, the number on the quote probably is too. Keep the written quote with the unit's paperwork, since both matter if you ever claim the warranty or sell the house.
Why code items are not optional extras
The safety items in a quote come from the California Plumbing Code, which is based on the Uniform Plumbing Code (UPC), and from the manufacturer's installation instructions. If a quote leaves out straps or a relief drain, the inspector may fail the job, and you pay to fix it afterward.
Pleasant Hill: permit and water supplier details
The Martinez handout says water heater installations need a permit, and Martinez can issue replacement permits over the counter. Pleasant Hill may handle this differently, so ask the Pleasant Hill building division which permit applies to your replacement.
Your supplier matters for tankless units. Contra Costa Water District serves parts of Pleasant Hill, and your bill names the provider. We do not quote a hardness number for your address, so test your tap or ask your supplier for its water quality report before you size a descaling plan.
See the Concord page and Lafayette page if you live nearby and want details on those areas.
Local questions
A complete job includes the unit, connectors, a relief valve and drain, seismic straps, a gas or electrical connection, venting on gas units, a permit and removal of the old tank.
Water heater installations generally need a permit in California cities. Ask the Pleasant Hill building division.
One may include straps, venting, the permit and haul-away, and the other may not. Compare the scope.
Upfront, usually yes, because of gas and venting work. Running cost and space savings vary.
Yes, and it should be listed in the quote.
Still have a question about your situation? Call (855) 575-2890 any hour and describe what you are seeing.