Check the license first
- Ask for the license number.Every contractor doing this work in California should be able to give you a CSLB license number.
- Look it up.Search the number at cslb.ca.gov and confirm the license is active.
- Match the details.Make sure the business name matches the company you are dealing with and the classification fits the work.
- Check workers.Ask whether employees or subcontractors will do the work, and confirm any subcontractor is licensed too.
Questions about the job
- How did you size the unit, and what peak flow did you assume?
- Did you check our gas line size and total load?
- What vent material and route does this unit need?
- Will you install service valves with flush ports?
- Is a condensate drain or neutralizer needed?
- Who pulls the permit, and is the inspection included?
- What does the written scope exclude?
Good signs and warning signs
| Good sign | Warning sign |
|---|---|
| Looks at the gas line, vent and fixtures before quoting | Quotes a unit over the phone without seeing the house |
| Explains sizing in terms of flow and temperature rise | Picks the largest unit without discussing gas supply |
| Puts the scope and price in writing | Prefers a verbal agreement |
| Addresses the permit and inspection | Suggests skipping a permit the job needs |
| Talks about flushing for hard water | Never mentions maintenance |
Before you sign
- License verified at cslb.ca.gov
- Written scope with unit, gas, vent, valves, condensate and permit listed
- Payment terms in writing
- Warranty paperwork for the unit and any workmanship terms in writing
- A clear start date and expected duration
Warranty work and brand experience
Tankless manufacturers sometimes require registration or approved installers for certain warranty terms. Before choosing a brand, ask the plumber whether they install it regularly and who would handle warranty service. If you already own a unit, check the warranty card or the manufacturer's site to see whether repairs must go through a particular channel.
Common questions
Does a plumber need a special license for gas work?
Check the contractor's CSLB classification at cslb.ca.gov and ask whether it covers the gas piping in your job.
How many quotes should I get?
Enough to compare scopes. Two or three itemized quotes for the same work usually show the differences clearly.
Should I worry if a plumber recommends a different unit?
Not necessarily. Ask why, and compare the reasoning on sizing, gas supply and venting.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.