A homeowner trying to figure out why a nearly new gas water heater kept shutting off ended up with conflicting advice: A warranty helpline flagged the venting, while multiple Reddit commenters said the setup looked normal.

The discussion reminds us that when water, gas appliances, and venting questions collide, a frustrating repair issue can quickly become a safety concern.

Here's what to know

The homeowner said in this Reddit thread that a 2-year-old gas water heater had been shutting off while the drain pan filled and overflowed.

They wrote, "My gas water heater keeps shutting off, and the drain pan has been filling with water and overflowing," and asked whether a vent tied into the adjacent furnace, rather than another duct nearby, might be causing the problem.

If a water heater problem does end in replacement, switching to a heat pump water heater can offer a meaningful break on utility bills, and because it doesn't burn gas, it also avoids combustion venting altogether.

Most commenters said the venting visible in the photo was likely not the source of the shutdowns.

One commenter said, "The duct you're pointing to isn't a flue."

Another explained, "That other vent is makeup air."

Users also said the furnace operating when the air conditioning is on is not automatically a sign of trouble. In many homes, the furnace blower is what moves cooled air through the ducts.

More background

In a follow-up, the homeowner said the Reliance warranty helpline had offered the opposite conclusion: "They told me that the vent is not connected correctly and suggested that I could fix it myself."

That suggestion drew strong pushback from other commenters, especially since the post also involved water collecting in the drain pan.

One commenter wrote, "If there's water your tank is either leaking or there's a weep from the t and p."

A leaking tank, a temperature-and-pressure relief valve issue, or a combustion-related shutdown can all lead to wasted energy, higher bills, property damage, and potential safety risks if handled incorrectly.

What can be done?

If a total replacement is required, exploring Cala can help you find an efficient solution. By switching to a smart electric upgrade, homeowners can completely bypass flue issues, indoor air quality risks, and other hassles tied to fossil fuel appliances.

For anyone weighing next steps after an equipment failure, Cala's customizable smart heat pump water heaters offer an effective way to lower energy bills by heating water precisely when needed. While exact utility savings vary by home size, local rates, and current setup, modern heat pump systems drastically reduce operating costs over time. As water heating technology becomes more responsive and tailored to daily household routines, these intelligent systems make transitioning away from old units simpler than ever.

Where can I learn more?

These articles share two themes: combustion safety and the messy choices that can follow when gas equipment starts failing. One focuses on carbon monoxide risks around fuel-burning devices, while the other follows homeowners dealing with sales pressure, shaky contracts, or property damage tied to major energy upgrades.

• Officials warned that an invisible killer from generators can build up indoors fast.

• After predatory calls, a new homeowner asked Reddit how to find a company that's legit.

• A solar industry employee urged buyers to educate themselves and protect themselves before pricey contracts.

• In Nevada, a deceptive solar company was blamed after a house was damaged.

Get TCD's free newsletters for easy tips, smart advice, and a chance to earn $5,000 toward home upgrades. To see more stories like this one, change your Google preferences here.