Endless Hot Water, No Tank In The Garage
A tankless hot water heater heats water as it passes through, so there is no tank sitting in the garage staying hot around the clock and no forty-gallon limit on a long shower. A gas burner or electric element fires when a tap opens and stops when it closes.
The part nobody mentions at the point of sale is that San Diego County has hard water, and hard water is what kills tankless units. Scale builds on the heat exchanger, efficiency drops, and eventually the unit faults out years before it should. An annual flush prevents that, and it is the single biggest factor in whether a tankless install is a good decision or an expensive one.
We install, repair and flush every major brand, residential and commercial.
Five real advantages, and one maintenance requirement that decides whether you get to keep them.
Water is heated as it passes through, so the supply does not run out. Back-to-back showers and a dishwasher at the same time stop being a scheduling problem.
No tank of water kept hot around the clock waiting to be used. The unit fires when a tap opens and stops when it closes.
A wall-mounted unit roughly the size of a carry-on replaces a forty or fifty gallon tank, which usually gives a garage or closet back.
A well-maintained tankless unit typically outlasts a tank heater by a wide margin. The words doing the work in that sentence are "well-maintained".
No standing water sitting in a tank collecting sediment, which is the source of the rusty first draw people get from an aging tank heater.
San Diego County has hard water, and scale on the heat exchanger is what ends tankless units early. A yearly flush is the difference between the lifespan above and a warranty claim.
Find yours below. If you have no hot water right now, call rather than read.
Tankless is not automatically the right answer. Here is where each one actually wins.
| Tankless | Conventional Tank | |
|---|---|---|
| Hot water supply | Continuous, does not run out | Limited to tank capacity |
| Standby energy loss | None, heats only on demand | Keeps water hot around the clock |
| Space | Wall-mounted, small footprint | Floor space for 40 to 50 gallons |
| Upfront cost | Higher, especially if gas or venting needs work | Lower to buy and install |
| Maintenance | Annual flush is not optional in hard water | Occasional flush, more forgiving |
| Typical lifespan | Longer when maintained | Shorter, but fails more gracefully |
| Best fit | High demand, long-term ownership | Lower budget, simple replacement |
Gas line capacity, venting and electrical come first. A tankless unit the gas supply cannot feed is a problem nobody wants to discover at install.
Sized to your real demand, not the biggest unit we stock. You get the installed price in writing, including any gas or venting work it needs.
Installed, tested and registered for warranty, with the first annual flush scheduled before we leave.
"Cesar was very knowledgeable and professional. He knew what the problem was and resolved our issue very quickly! Would highly recommend Hack's Plumbing & Drain to my family and friends!!!"
"I've been working with Hack for over 20 years, he and his team are the only ones I trust. From small job to large, they always get it done right and take care of you."
Tell us about your hot water situation. We'll check what the house can support, size it properly, and tell you honestly if a conventional tank is the better call.
Repair, replacement and commercial units, including when a tank still makes more sense.
See Water HeatersNeighborhood-level notes for the eight cities we publish, from coastal corrosion to hard water inland.
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