Hot Water Recirculation

Hot water recirculation systems reduce wait times and deliver hot water more quickly to distant fixtures in homes throughout La Jolla, Del Mar, Solana Beach, Encinitas, Cardiff-by-the-Sea, Carlsbad, and Rancho Santa Fe.

If the master shower is on the other side of the house from the water heater, the first minute at the tap is cold water running down the drain. In a region that takes water seriously, that wait is both an annoyance and a waste. CF Plumbing diagnoses circulation problems, installs or replaces pumps and controls, and configures dedicated return lines or tankless recirculation so the system is convenient without running a pump all day for no reason.

How recirculation works in a real house

In a conventional layout, hot water sits in the pipe and cools after the last use. The next person runs that cooled water out before hot water arrives. A recirculation system keeps a controlled loop of hot water moving — either through a dedicated return line back to the heater, or through a carefully designed crossover at a far fixture — so the wait drops from a minute-plus to a few seconds.

On tankless systems the idea is the same, but the controls are different. Many Navien and similar units can run a recirculation mode. That mode has to be set for the house. A pump that runs continuously, or a loop that was never insulated, can waste energy and short-cycle the heater. A loop that was never commissioned does nothing at all.

We have installed and serviced Grundfos and other residential recirculation pumps for years, including systems that use a dedicated return and systems built around the water heater’s own recirc function. See also Hot Water Takes Forever? and Hot Water Recirculation — How It Works in our plumbing advice section.

Homes that benefit most

Single-story ranches and coastal houses in Encinitas, Cardiff-by-the-Sea, Del Mar, Rancho Santa Fe, Carlsbad, Solana Beach and La Jolla with long runs to a far bath
Two-story homes where the heater is in the garage and the master is above and opposite
Larger properties in Rancho Santa Fe, Fairbanks Ranch and La Costa where fixtures are spread out
Households tired of wasting several gallons every shower while they wait
Tankless installations that heat water quickly at the unit but still cannot shrink the pipe length to the fixture

What we install and repair

Dedicated hot-water return lines where the home can accept them
Recirculation pumps, check valves, timers, aquastats and on-demand buttons
Tankless recirculation configuration, including existing Navien recirc settings
Replacement of noisy, leaking or failed pumps
Diagnosis when a recirc system runs and the far bathroom is still cold

Not every house needs a full return line cut through finished space. Some layouts can use a more limited solution. We would rather design the smallest system that solves the wait than sell the most pipe.

Problems we see on existing recirc systems

A pump that runs all day because nobody set a timer or temperature control
A crossover valve installed at the wrong fixture
No insulation on the loop, so the pump fights cooling pipes
A tankless recirc mode that short-cycles the burner
A failed check valve that lets cold water mix into the hot line
Air, scale or a dying pump that moves almost no water

If hot water is slow and there is already a pump on the heater, do not assume you need a second pump. The first one may be the problem.

Water savings and comfort

A family that takes several showers a day and waits 45 to 90 seconds each time is sending a lot of potable water down the drain over a year. Recirculation does not replace conservation somewhere else in the house, but it stops that particular waste and makes the far bathrooms usable. In drought-aware San Diego County, that combination — comfort plus less wasted water — is the reason these systems get installed in both new work and existing homes.

Frequently asked questions

Will recirculation raise my energy bill?

A pump that runs without control will. A loop on a timer, an aquastat or an on-demand button moves far less energy. We set the controls to the way the house is actually used.

Can you add recirculation without opening walls?

Sometimes. It depends on access through a garage, attic or crawl space and on whether a dedicated return already exists. We look before we promise.

My tankless heater has a recirc button. Isn’t that enough?

It can be, if the plumbing supports it and the settings match the house. Many units are left on factory defaults that do not. That is a configuration visit, not necessarily new equipment.

Is this the same as an under-sink instant-hot dispenser?

No. An Insta-Hot or similar point-of-use heater at the kitchen sink is a different product. Recirculation serves the whole hot-water system.