Heat pump water heaters are often promoted with a simple, shorthand promise: they consume less electricity than standard electric tanks. While that’s generally a true statement, it only scratches the surface of what makes HPWH units a commendable option for homeowners who desire smarter energy use.

For plumbers, HPWHs should be positioned not just as an efficiency upgrade, but as a practical tool for load shifting and grid-friendly operation, ultimately helping customers save money and improve performance in ways that conventional equipment may not always match.

A difference in load shifting

Load shifting is one of the primary means by which water heaters manage energy. Essentially, it means shifting the bulk of electricity consumption from high-cost, peak demand hours to low-cost lulls. Doing so reduces grid strain, and thus can be a smart way for homeowners to conserve power and lower utility bills.

The conventional electric water heater has a 4500w heating element. It draws power whenever the thermostat calls for it, irrespective of what’s happening on the grid. HPWHs work differently. Rather than generating heat directly during a utility event, they move heat from surrounding areas, then store it in a storage tank. They typically use just 550w, a much smaller amount of energy. But, because these are hybrid, they can also generate heat as needed using a 4000w element along with the heat pump. This allows homeowners to ensure they have consistent performance while still easing strain on the power grid.

The simple fact is that they draw less power from the grid, being well over 100% efficient; it also means they are good candidates for scheduled operation and thermal storage.

Think of the storage tank as a kind of battery. If you can heat water away from peak hours and coast through those hours when demand is higher, drawing primarily from what’s stored in that tank, you reduce stress on the grid and potentially decrease the energy bill. The effect can be significant enough that, in many regions, utility companies will offer incentives to homeowners who help them regulate grid strain.

Water heaters as grid assets

Specifically, demand response programs pay customers to reduce or shift electricity use during specific times, often hot summer afternoons or cold winter mornings when demand tends to spike.

HPWHs are strong candidates for demand response programs, for a few different reasons:

• In most households, hot water demand is flexible; it’s very feasible to pre-heat water and then ride out windows of major demand.
• These windows of demand are usually quite short, often no more than an hour or so. Most HPWHs can more than match that level of demand.
• As HPWHs are more widely adopted, their impact on the utility grid can be chained and multiplied across many homes in the same community.

For plumbers talking with customers, the main emphasis isn’t the technical explanation, but rather the end result: the water heater can automatically accommodate the needs of the grid, and the customer can be compensated for it in both direct and indirect ways.

Understanding utility incentives

As utility companies boost their incentives for grid benefits, HPWHs are increasingly attractive. For plumbers, knowing how to communicate these incentives can be an important way to convey overall value, minimizing any sticker shock over HPWH installation.

Some key categories to consider include:

• Upfront rebates. Equipment and installation rebates are widespread, and generally pretty easy for customers to understand. Most are given at the point of purchase, instantly reducing the cost when purchased by the plumbing contractor. They should always be clarified in any discussion of a HPWH upgrade.
• Demand response enrollment payments. When customers use their new HPWH to sign up for a demand response program, they may be eligible for a one-time signup bonus, ongoing bill credits of seasonal participation payments.
• Time-of-use rate leverage. Even customers who are not enrolled in a demand response program may still get more favorable utility rates when they heat their water during a window when electricity is cheaper. This is where automated load shifting can make an enormous difference.

Avoiding the efficiency lecture

One of the real tricks for plumbers is presenting the benefits of HPWHs in a way that steers clear of cliched “energy efficiency” lectures. There are several customer-friendly framing options that plumbers can use to properly convey the benefits of an HPWH upgrade:

• “The energy cost is much lower.” According to their respective Energy Guides, an HPWH can cost only $117 a year to operate while the same size standard electric shows $494.
• “This helps you avoid paying for electricity when it’s most expensive.” Homeowners may not be aware that electricity costs vary throughout the day or throughout the week. Explaining that they can draw much of the power they need for water heating when prices are at their lowest can be highly persuasive.
• “You can get paid to participate.” Alerting homeowners that they may actually be incentivized by their utility company can help close the deal, especially if homeowners are already aware of rising utility costs in the area.
• “Why wait?” New Department of Energy standards will require using Heat Pump Water Heaters, as of May 6, 2029, for all residential electric tanks 35 gallons and above. For homeowners who need a new water heater, it might make sense to simply go ahead and upgrade.

Heat pump water heaters are more than just an efficient type of tank; they can help customers shift usage to cheaper, cleaner hours and potentially earn incentives through demand response. For plumbers looking to offer higher-value solutions, HPWHs can open the door to new conversations, and potentially whole new ways to think about smart energy use.