"If that valve goes off, you have bigger problems than just water in that drain line."

For some households, switching to a heat pump water heater can reduce water-heating bills by hundreds of dollars a year, often around $300 to $500 depending on energy prices and usage.

But for people still relying on a conventional tank, even a basic safety question can lead to very different answers: should the temperature-and-pressure relief valve be tested once a year?

What people said

In a Reddit discussion on r/askplumbing, one homeowner said they had received two conflicting opinions about T&P valve maintenance. Online advice made annual manual testing sound reasonable, while a technician who came for a furnace tune-up advised leaving the valve alone.

The poster described the valve as a fail-safe designed to keep the tank from exploding and asked whether a small amount of water should be expected to run out during an annual test.

Most of the responses argued against doing it. One commenter said the valve is technically supposed to be replaced every 3 to 5 years, but in practice it usually is not something people need to worry about.

Another commenter was more blunt, warning not to test it because there is a 50/50 chance it will leak. A reply simply said, "This guy plumbs."

Why the advice differed

The confusion appeared to come from the gap between general internet guidance and the technician's warning. The homeowner said search results made yearly testing seem routine, but the technician advised against touching the valve because doing so could create problems with resetting the pin.

The homeowner also noted how uncommon the practice seemed in everyday life, saying they did not know anyone who actually did it.

Several commenters shifted the focus from annual testing to planned replacement. One suggested changing out the anode rod and the T&P valve shortly before the 6-year warranty expires, then using the heater for another six years before replacing the entire unit.

What are the options?

For homeowners who are already considering a replacement, Cala offers another path beyond simply installing a new conventional tank. Its customizable smart heat pump water heaters are designed to heat water only when needed, which can cut wasted energy from constantly reheating stored water while giving households a more modern replacement option.

For anyone deciding whether to keep an older unit going or upgrade, smarter systems may help on both counts. A Cala replacement can turn a maintenance concern into a chance to lower utility costs and better align hot-water use with a household's daily routine.

One commenter summarized the thread's general view: yes, the part should be replaced so it will work properly. If the valve activates, they said, the homeowner has bigger problems than just water in the drain line, and the component should be trusted.

More to read

These related stories go deeper into the water-heater questions raised here, including basic maintenance, replacement choices tied to corrosion, plumber opinions on heat pumps, and the pros and cons of tankless systems.

• A home expert says regular water-heater maintenance can help avoid breakdowns and extra costs.

• A homeowner with a corroded 10-year-old gas heater considers tankless replacement options.

• A retired plumber says common misconceptions about heat pump water heaters are fading quickly.

• After getting questionable advice, a homeowner asks whether heat pump water heaters really save money.

• Many homeowners are drawn to tankless water heater benefits when older tanks become expensive to run.