Tankless Water Heater in Bonita, CA

How hard is Bonita's water on a tankless unit?

Bonita is served by Sweetwater Authority, which blends water from the Sweetwater River and Sweetwater Reservoir with deep freshwater wells in National City, brackish wells in Chula Vista treated by reverse osmosis, and imported Colorado River or State Water Project water. Sweetwater's report lists total hardness of 94 to 300 ppm as calcium carbonate, with an average of 196. In a tank heater, minerals settle to the bottom; in a tankless unit they coat the small passages of the heat exchanger, where they cut flow and trigger overheat shutdowns. Isolation valves for an annual flush are the minimum, and some owners add a softener or a scale-control cartridge.

Will a 1970s Bonita house need extra work?

Often, yes. With a median build year around 1975, many Bonita homes still have the original heater location, flue and gas branch line. A tankless burner can't vent into a flue sized for a tank, so it needs its own vent, usually through a nearby exterior wall. The gas line from the meter is often too small for a whole-house unit firing at full input. The swap is also a sensible time to replace old shutoff valves and flexible connectors around the heater. On larger lots, a long run from the heater to a far bathroom may make a recirculation option worth discussing.

Who handles permits for a Bonita address?

That depends on where your property sits, and it is worth confirming before work starts. Ask the building department that covers your address whether a water heater or gas piping permit is needed. A plumber who works in the area can usually tell you which office handles your street and will pull the permit and arrange the inspection as part of the job.

One Bonita note

Sweetwater Authority's service line inventory found no lead or galvanized service lines needing replacement, including the customer-owned side, so the service line to the house isn't a lead concern; piping inside the home is a separate question. For a water problem on the utility's side of the meter, call Sweetwater at (619) 420-1413, which the authority also lists for after-hours emergencies. A leak at the heater itself is a plumbing call: close the cold supply valve above the unit while you wait. If you ever smell gas, leave the home first and then call 911 and SDG&E at 1-800-611-7343 from outside.