Coronado makes tankless water heater change-outs fairly simple on the permit side: same-location water heater and tankless swaps can be permitted over the counter by email. The bigger questions are salt air, venting and gas supply. Call the number on this page to be connected with a local plumber in Coronado.
Coronado's water reaches homes through California American Water, which serves the city under contract and buys treated surface water from the City of San Diego's Alvarado and Otay plants. Cal Am's report lists hardness at those plants of 145 to 280 ppm as calcium carbonate (about 8.5 to 16.4 grains per gallon), and the water is chloraminated. Add the ocean air that surrounds the island and its many older homes, and a tankless install here is mostly about placement and protection.
What to do now
- Decide where the unit goes. An indoor direct-vent unit avoids salt exposure; an outdoor unit needs a sheltered wall away from direct sea breeze.
- Check the gas supply. Find your SDG&E meter and note how far it is from the heater. A long run in a small pipe usually has to be upsized.
- Plan for scale. Ask for isolation valves so the heat exchanger can be flushed each year, and consider a scale-control cartridge.
- Line up the permit. The City of Coronado Building Services Division issues over-the-counter permits by email for same-location water heater and tankless change-outs and for gas line repairs. Call 619-522-7331 with questions.
- Think about distance. In a long or two-story house, ask whether a recirculation pump would cut the wait at far bathrooms.
Symptoms and likely causes
| Symptom | Likely cause |
|---|---|
| Hot water flow weaker each year | Scale in the heat exchanger or a clogged inlet screen |
| Corroded outdoor cabinet or fittings | Salt air on an exposed wall |
| Unit won't fire at a low-flow faucet | Flow below the activation minimum |
| Burner lights, then shuts down | Undersized gas line or a blocked vent |
| Brief cold slug between hot runs | Normal cold water sandwich after a short pause |
What affects cost
The largest factors are gas pipe sizing from the meter, the vent route, and whether the unit stays in the old tank location or moves. Older homes with limited wall space or historic details may need a more careful vent path, and outdoor units on the island benefit from corrosion-resistant hardware. Scale filters and recirculation add to the first cost. For a water problem on Cal Am's side of the meter, call (888) 237-1333. If you smell gas, leave the house first and then call 911 and SDG&E at 1-800-611-7343 from a safe distance.
Tankless Water Heaters questions in Coronado
Does switching from a tank to a tankless heater need a permit?
Can a tankless heater be mounted outdoors near the coast?
Can a recirculation setup shorten the wait for hot water?
Does chloraminated tap water cause problems for a tankless heater?
More plumbing services in Coronado
Tankless Water Heaters nearby
Sources
Last updated: