California's New Heat Pump Water Heater Law: What Homeowners in Ontario, CA Actually Need to Know

There's been a lot of noise lately about California's new water heater law, and most of it is wrong. We've been getting calls from homeowners in Ontario, Rancho Cucamonga, and Fontana who think they have to rip out their gas water heater and drop in a heat pump before the end of the year. They don't. So let's clear this up in plain English.

What actually changed

The 2025 update to California's Title 24 building code took effect January 1, 2026. For new single-family construction permitted on or after that date, heat pump water heaters are now the baseline. When a builder pulls a permit for a brand new home, the code assumes a heat pump unit as the default. It is not a gas ban. Gas is still allowed. But if a builder wants to install gas in a new home now, the code requires them to make up for it somewhere else, usually with extra insulation, solar, or other efficiency measures. In most cases those offsets end up costing more than just putting in the heat pump unit to begin with, which is why builders are moving that direction on their own.

That is the whole change. Baseline for new construction. Not a mandate to swap out what's already in your garage.

What this means for your existing water heater

Here's the part we keep having to say out loud. You are not required to replace your working gas water heater. Not now, not on January 1, 2026, not next year. The law does not say that anywhere. It's a new-construction and major-permitted-remodel rule. If your gas water heater is doing its job, keep using it.

When it eventually fails, you can replace it with another gas water heater like-for-like. That is still allowed. The rule targets what goes into brand new homes and some major permitted remodels, not what you use to swap out an old unit in your existing home. The whole "gas is banned" story making the rounds is misleading.

When the rule actually kicks in

The change matters if you are building a new home in Corona or Chino, adding a permitted second-floor addition in Pomona, or doing a major gut remodel that requires a mechanical permit and touches the plumbing systems. In those cases your project falls under the current code, and the baseline is heat pump. Your contractor and the permit reviewer will tell you exactly what applies.

But if you are a homeowner in Upland or West Covina and your existing tank goes out on a Sunday morning, you can put in a new gas unit the same day. That's a routine replacement and the new baseline does not apply. No permits, no code trigger, no problem.

What about rebates and cost

We want to be honest here because we have had customers show up expecting rebates that are not there anymore. The main state programs that were paying big incentives for switching from gas to heat pump, TECH Clean California and HEEHRA for single-family homes, are effectively fully reserved or exhausted right now. Whatever articles you read a year ago about big rebates need to be checked against what is actually available today. It moves fast.

There are still some utility-level programs floating around through SCE and SoCalGas, and they open, close, and change eligibility rules constantly. Before you commit either direction, call us and ask what is currently available, or check directly with your utility. We would rather you get real information than get talked into a decision based on a rebate that is already gone.

Beyond the rebate question, heat pump water heaters have real installation requirements you should know about. They need electrical capacity, they need a certain amount of space and airflow, and older Rancho Cucamonga and Fontana homes with 100-amp panels sometimes need a panel upgrade before a heat pump unit will work. That is not a deal breaker, but it is a real cost you want to know about upfront before you commit.

How to figure out what's right for your home

The honest answer is it depends. We install and service both gas and heat pump water heaters across our service area. When we come out for an evaluation, we look at your electrical panel, your existing water heater setup, where the unit lives (interior closet, garage, attic), and the overall layout of your home to tell you which option actually makes sense. Then we walk you through what a real installation would look like, what it would take, and what's currently available for incentives.

If you are in Ontario, Rancho Cucamonga, Fontana, Pomona, Corona, Upland, West Covina, or Chino, and you want a straight read on your options for [water heater installation](/water-heater-services) before you commit to anything, call us for a free evaluation. No pressure, no upsell. We'll tell you what your home is actually set up for and let you make the call.