)
Using dynamic electricity tariffs for heat – with Spotty
Dynamic electricity tariffs are particularly worthwhile when large consumers can be controlled – such as an EV or a heat pump. But there’s another major electricity consumer in every household that is often overlooked: hot water preparation. With its high electricity demand, heating water is ideal for taking advantage of flexible electricity prices – with or without a PV system.
Partnership for maximum efficiency
With Ostrom, the provider of dynamic electricity tariffs at wholesale market prices, we have a strong partner at our side. While Ostrom supplies flexible electricity pricing, we at my-PV provide the matching solutions: from continuously adjustable PV immersion heaters to smart heaters that automatically follow the cheapest market hours. Everything is developed and produced at our site in Neuzeug, Upper Austria – true Quality Made in Austria.
Ostrom is a German electricity provider specializing in variable and dynamic tariffs. With Ostrom, you don’t pay a profit margin per consumed kWh. Instead, you get electricity at cost price and only pay a monthly service fee of €6. The Ostrom app provides hourly insights into your consumption and allows you to connect devices such as inverters, EVs, wallboxes, and many other smart devices.
With the SimplyDynamic tariff, you benefit directly from wholesale market prices: costs change hourly, based on the energy exchange. This means you can save money by shifting consumption to the cheapest and greenest hours – for example, when the sun is shining or the wind is blowing, creating an energy surplus.
Maximizing self-consumption with your own PV system
Anyone with a PV system knows the challenge: too little self-consumption, too much surplus. That’s exactly where our solutions come in:
AC ELWA 2 – linearly controoled PV immersion heater
AC•THOR & AC•THOR 9s – intelligent photovoltaic power managers
Both systems channel surplus PV electricity directly into hot water or heating. This ensures maximum solar energy use at home – with double benefits: you don’t give away electricity for free at negative market prices, and at the same time, you lower your heating costs.
On cloudy days, when PV yield is low, our my-PV DTO takes over – automatically, at the cheapest tariff hours, and with PV forecasting, ensuring no unnecessary grid electricity is consumed. The my-PV DTO optimizes heat generation for my-PV devices with a PV system, combining the best of both worlds: solar heating and cost-efficient top-up heating from the grid, perfectly synchronized.
Smart savings without a PV system
Even without your own PV system, you can prepare hot water in a cost-optimized way:
With the new HEA•THOR IoT, our network-enabled immersion heater for dynamic electricity tariffs (market launch: Q3/2025). Simply install it into a hot water or buffer storage tank – the control via tariff data is managed by the my-PV Cloud. Hot water production is then automatically shifted to the cheapest hours. Comfort is guaranteed: the water is always available, with temperature values and thresholds configurable for reliability.
Rethinking heat intelligently
With or without a PV system – heat generation is the key to unlocking the full potential of dynamic tariffs. Get the most out of your flexible electricity contract and sustainably reduce your energy costs.
)
Curious about the benefits? Join our partner webinar (in German)
Discover all details about our solutions and the advantages with Ostrom in our joint webinar on November 26, 2025. Register now and benefit!
Webinar my-PV / OSTROM (in German)
Register now!Date e eventi futuri
Sempre aggiornato
I nostri webinar e altri eventi creano un vantaggio di conoscenza inestimabile per te. Registrati ai nostri webinar e altri eventi e resta informato.
Visualizza tutte le date e gli eventiNon perderti nulla!
Iscriviti ora alla nostra newsletter!
Il bollettino informativo alimentato a energia solare con molti vantaggi per te!