Water heater work touches water, gas or high-voltage electrical, venting and seismic bracing all at once. The cheapest-looking quote can leave out pieces that matter for safety, and the most expensive one can include work you don't need. A consistent checklist lets you compare contractors on substance.
California licenses contractors through the Contractors State License Board. Ask for the license number and look it up yourself at cslb.ca.gov rather than relying on a logo or a card.
Before you agree to work
- I have the contractor's CSLB license number and checked it at cslb.ca.gov
- The license is active and the classification fits the work
- I know whether employees or subcontractors will do the job
- The diagnosis is explained: what failed and how it was tested
- The estimate is in writing with a total price
- For replacement: type, fuel and size are named
- Strapping, the relief valve discharge line and venting are addressed
- Who obtains any permit the City of Orange requires is stated
- Removal and disposal of the old heater is included or priced
- Payment terms are clear before work starts
Green flags and red flags
| Green flag | Red flag |
|---|---|
| Gives a license number without hesitation | Avoids giving a license number |
| Explains repair and replacement options | Insists on replacement without explaining why |
| Puts scope and price in writing | Only quotes verbally |
| Mentions strapping, venting and permits | Treats the job as a simple swap with no mention of safety items |
| Asks about your gas line and hot water use before sizing | Picks a unit without asking about your household |
A sensible hiring sequence
- Make it safe first.Shut off water and energy if there's a leak; leave and call from outside if there's a gas smell.
- Gather your info.Rating plate photo, symptom notes and the heater's location and access.
- Check licenses.Look up each contractor at cslb.ca.gov before they visit.
- Compare written estimates.Use the estimate comparison worksheet to line them up.
- Confirm before work starts.Scope, price, permit and timing agreed in writing.
Common questions
What does a CSLB lookup tell me?
Whether the license is active, its classifications, and other public information the board provides. Check it before signing.
Should I get more than one estimate?
For a replacement that isn't an emergency, comparing at least two written estimates is common sense.
Is it a bad sign if a plumber recommends replacement?
Not necessarily. A leaking tank has to be replaced. Just ask what they saw and get the reasoning in writing.
General information for Orange, not a quote or professional advice. In an emergency, call 911.