● Covered by 1 source · 1 reportLow impact1 neutral
Hitachi Launches CO2 Heat Pump Water Heaters with Solar-Friendly Tariff Controls
Key points
- Hitachi launches new EcoCute Y series heat pump water heaters.
- Models use natural CO2 refrigerant, available in 370L and 460L capacities.
- Features expanded compatibility with solar-friendly daytime electricity tariffs.
- Sales for the Japanese market begin progressively in November 2026.
New EcoCute Y Series Introduction
Hitachi Global Life Solutions, a subsidiary of Hitachi, announced a new line of residential EcoCute heat pump water heaters, designated as the Y series. These units are designed for the Japanese market, with a progressive sales rollout scheduled to commence in November 2026.
Product Specifications and Capacities
The Y series utilizes natural carbon dioxide (CO2) as a refrigerant and will be offered in various configurations. Flagship models include the BHP-FV37YD (370 liters) and BHP-FV46YD (460 liters), both fully automatic and providing direct mains-pressure hot water. The 370-liter model is intended for households of three to five people, while the 460-liter unit targets four to six people.
Full efficiency specifications have not yet been disclosed for the new models. Their predecessors, the BHP-FV37WD and BHP-FV46WD, had Japanese Industrial Standards (JIS) annual hot-water and heat-retention efficiency ratings of 4.2 and 4.1, respectively.
Enhanced Tariff Compatibility
A key update in the Y series is its expanded compatibility with Japanese electricity tariffs that incentivize shifting electricity consumption to daytime hours. These tariffs are designed to accommodate increasing solar generation on the grid. Y-series owners can select supported electricity contracts via the water heater's remote controller, with manual configuration options for other tariffs.
This new functionality is specifically aimed at electricity plans that promote daytime consumption, including those beneficial for households equipped with photovoltaic (PV) systems.
Home Energy Management System Support
The new Y series also supports Hitachi’s home energy management system (HEMS) through an optional HEMS connection adapter and wireless LAN adapter. HEMS connectivity is not a new feature for Hitachi's high-efficiency EcoCute products, as previous models like the BHP-FV37WD and BHP-FV46WD already offered connected energy-management functions, including Echonet Lite compatibility.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
The daily brief
One email each morning: the day's tech stories, clustered across outlets and summarized. No account needed.
One email a day. Unsubscribe in one click, any time.
Today's brief
Spend a few minutes, get the whole day. Every topic's top stories in one hands-free rundown — listen, watch, or read the transcript.
▶ Play today's brief
New every morning, and the back catalogue is archived by date.
Reporting from
Hitachi Global Life Solutions introduced a new series of residential EcoCute heat pump water heaters for the Japanese market, with sales starting in November 2026. These models use CO2 refrigerant and feature expanded compatibility with Japanese electricity tariffs that encourage daytime energy consumption, particularly for solar-equipped homes.