PV hot water storage tanks from brand manufacturers at PVundSO

A PV hot water storage tank uses the electricity from your photovoltaic system specifically for hot water preparation, thus significantly increasing the self-consumption of your solar system. The principle is simple: An electric heating element in the tank heats your domestic hot water whenever the PV system generates more energy than is needed in the household. At PVundSO, you will find all the components for such a system from a specialized retailer.

The range of photovoltaic systems with heating elements includes both individual heating elements and pre-configured sets with solar modules. The manufacturer my-PV supplies the core technology: continuously variable heating elements that adjust their output to the available solar surplus with second-by-second precision. From the compact 2 kW solution to the powerful 9 kW system, the range covers a wide variety of requirements.

All photovoltaic products in the shop are exempt from VAT. This legal regulation applies to all PV components and significantly reduces the investment costs for your PV hot water storage tank. PVundSO also offers free shipping within Germany for orders over €100.

Significantly reduce energy costs with the PV hot water storage tank

Hot water preparation accounts for roughly 12 to 15% of total energy consumption in an average household. For a family of four, this equates to approximately 2.000 to 3.000 kWh per year. Those who cover this demand with their own photovoltaic system can reduce their annual energy costs by a three-figure sum, depending on the system size and consumption profile.

The financial leverage lies in the price difference between self-generated and purchased electricity. While a kWh from the energy supplier currently costs around 30 to 35 cents, a typical rooftop solar system generates electricity for 6 to 11 cents per kWh. Every kilowatt-hour stored in your PV hot water storage tank saves you the difference. With a hot water demand of 2.000 kWh and a solar coverage rate of 50 to 70%, this results in annual savings of 200 to 400 euros.

Additionally, you significantly reduce the load on your conventional heating system during the sunnier months. From April to September, the PV hot water storage tank can handle the entire hot water supply on many days. This protects the burner or heat pump and measurably extends its lifespan.

Key performance data for photovoltaic hot water storage tanks

Three key factors come into play when setting up a photovoltaic hot water storage system. The installed PV capacity on the roof, the heating element output, and the storage volume must be coordinated for the system to operate efficiently. The following table provides an overview of proven configurations for different household sizes.

The 2 kW DC ELWA is particularly well-suited for smaller households with an existing PV system . It requires no separate inverter and connects directly to the solar panels. The integrated MPPT controller automatically optimizes the yield based on sunlight intensity. Larger households benefit from the AC ELWA 2 or the AC-THOR, which operate via the mains electricity supply and can be integrated into an existing energy management system.

The solar coverage rate indicates what proportion of your annual hot water needs are met by your PV system. Even with a conservative design, most systems achieve a value of 45 to 65% on average throughout the year. This percentage is significantly higher in the summer months and regularly reaches full coverage on sunny days.

Combine hot water storage tank with heating element and PV system

An existing hot water storage tank can be converted into a solar-powered system with just a few components. The only requirement is a free 1,5-inch threaded connection, which is present on most tanks with a capacity of 150 liters or more. The heating element is screwed in, connected to the PV system, and the system is ready for operation.

There are two connection options. The DC version connects solar modules directly to the heating element. The integrated controller continuously adjusts the power output to the current solar supply. The AC version utilizes the existing inverter and the household electrical grid. It offers greater flexibility for integration into a complete system with battery storage and intelligent energy management.

Your conventional heating system remains fully operational and serves as a backup for days with low solar yield. It largely remains idle in summer, while automatically switching on as needed during the transitional seasons. This combination maximizes the benefits of your PV system without compromising the reliability of your hot water supply.

Advice and service for PV hot water storage tanks at PVundSO

PVundSO is run by Dirk Garve and Michael Westphal, two electrical engineers with extensive practical experience in photovoltaics and building technology. This expertise is available to you when planning your PV hot water storage system. From selecting the right heating element and the correct power rating to determining the optimal connection, you will receive well-founded, first-hand answers.

Shipping is available throughout Germany, free of charge for orders over €100. Alternatively, you can pick up your order in person at our collection point in Hildesheim (Rex-Brauns-Str. 12a) and receive on-site advice if needed. With a rating of 4,97 out of 5 stars based on over 2.900 customer reviews, PVundSO enjoys a high level of trust among buyers throughout Germany.

Special requests and individual configurations are also part of our service. If your requirements go beyond our standard product range, our team will find a suitable solution. Contact PVundSO by phone, email, or WhatsApp for a personal consultation regarding your PV hot water storage tank.