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State files updated Oct 28, 2026
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California contractor license

Net Zero Water Heating

Net Zero Water Heating of San Diego holds California license 1115960 (C36 Plumbing). The CSLB file dated Oct 28, 2026 lists it as active.1 It expires Feb 29, 2028.

Doing business as Core Energy Group Inc.

Active

Net Zero Water Heating, San Diego

License
1115960
Class
C36 Plumbing
Expires
Feb 29, 2028
Bond
$25,000
Workers' comp
Insured to Jul 1, 2027

CSLB file dated Oct 28, 2026

From the CSLB file dated Oct 28, 2026. Not a consumer report; check the board before you hire.

What bond, insurance and workers' comp are on file?

Bond
$25,000American Contractors Indemnity Company, from Jan 24, 2024, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredMidwest Employers Casualty Company, from Jul 1, 2025, to Jul 1, 2027

What work does this license cover?

Issued Feb 2, 2024.

What other licenses does this business hold?

Which other San Diego businesses hold C36 Plumbing?

Plumbing Contractors in San DiegoCalifornia plumbing contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
  5. Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.

If the license is lapsed

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 28, 2026)
  2. Contractors State License Board (CSLB)