How much energy can a hot-water tank store?
Stored energy depends on two things: how many litres the tank holds and how far its temperature can swing between full and empty.
An estimate. Real usable energy also depends on heat losses, how the tank is layered, and the temperatures your heating system and heat pump need. Batbubble's measured figures will be published after testing.
Why the same tank can hold 9 kWh or 60 kWh
Many buffer tanks are used over a narrow range, around 10 °C. At that range your tank above stores only .
Used over a wide range, from very hot down to the lowest temperature your heating can use, the same water holds several times more energy. That is why the temperature range matters as much as the size.
Batbubble is designed to use a wide range: the heat pump charges at temperatures it handles efficiently, and electric heaters can add higher-temperature heat from surplus solar or cheap hours. Read more about heat pumps and storage.
What do storage losses cost?
Any heat store loses some heat to the room around it. Better insulation means less energy spent replacing it. Batbubble is designed to save money in two ways.
Lower thermal losses
Better insulation means less energy is needed to replace heat lost from the tank. The calculator below covers only this part.
Cheaper heat production
Making more use of heat pumps, solar power and cheaper price periods could lower the cost of producing heat. This depends on each home and is not included in the calculator.
This is an assumption-based example, not a verified product result. It covers heat lost from storage only. It is not an estimate of your total heating or electricity bill savings.
Be among the first to get Batbubble.
Batbubble is in development. Join the waiting list for development and availability updates. It is not a purchase or reservation.