Eversource Heat Pump Water Heater Cost: A 90-kWh Tariff Example

A hypothetical heat-pump water heater using 90 kWh a month would add about $30.79 in variable charges on the Eastern Massachusetts R1 example below. The load is an assumption, not a tested product rating. The tariff inputs are historical April–July 2026 delivery and February–July supply figures for Greater Boston, Cambridge and the South Shore.

Water heating does not establish the account class

Eversource’s delivery table describes its separate heat-pump service in terms of equipment heating the home or part of it. A heat-pump water heater alone should not be assumed to qualify for that space-heating discount. This example uses ordinary R1 non-heating service; check your actual bill’s classification.

The historical basic supply price is $0.15629/kWh. All listed R1 variable delivery components for the stated area sum to $0.18580/kWh. Together they produce $0.34209/kWh and 90 × $0.34209 = $30.7881, rounded to $30.79.

The $10 customer charge belongs to the whole account. It is not an additional water-heater operating expense when the home already pays it. Assistance discounts, taxes and another delivery territory require separate adjustments.

Replace the assumed load

Ninety kWh could represent an assumed 3 kWh per day for 30 days. Actual consumption depends on hot-water demand, the model, operating mode and surrounding conditions. DOE’s water-heater overview explains the product and efficiency context; it does not establish that every unit uses 3 kWh daily.

Use the appliance’s energy record or properly installed circuit monitoring if available. Compare similar periods before drawing a savings conclusion. A household using 120 kWh rather than 90 kWh would add about $10.26 at this same historical variable rate.

For a current budget, replace both supply and delivery with the current account values. Keep the equipment purchase and installation quote separate: this calculation covers electricity only and cannot establish a payback period without the old heater’s fuel use and the installation difference.