Heating element for buffer storage tanks from brand manufacturers at PVundSO

An immersion heater for buffer storage tanks converts excess solar power directly into usable heat, significantly increasing the efficiency of your photovoltaic system. Instead of feeding this electricity into the grid at low feed-in tariffs, you can use it for hot water preparation and heating support. PVundSO exclusively carries products from my-PV, one of Europe's leading manufacturers of solar-based heat generation, in this category.

Our range of heating elements and immersion heaters includes both DC-coupled and AC-coupled models with outputs from 2 to 9 kW. The DC ELWA operates directly from your solar panels without an inverter, while the AC ELWA 2 and the AC-THOR are connected via the household electrical grid. Both versions can be retrofitted into almost any existing buffer storage tank and require no complex modifications.

All photovoltaic products at PVundSO are available with 0% VAT in accordance with current legislation. This significantly reduces the purchase costs and shortens the amortization period of your system. The shop also offers suitable solar modules and accessories for cabling and installation, so you can obtain all components from a single source.

Convert unused solar power into heat with the solar heating element.

Many photovoltaic systems generate significantly more electricity at midday than a household consumes at the same time. Without storage or a solar heating element, this surplus flows into the public grid, receiving a feed-in tariff that is far below the cost of purchasing electricity from the grid. A heating element in a buffer storage tank utilizes precisely this surplus and converts it into thermal energy, which can be stored for many hours.

The economic advantage becomes clear in a simple calculation. A kilowatt-hour of solar power from your own roof costs between 5 and 10 cents to produce, depending on the system size. Providing the same amount of heat via a gas heating system costs around 10 to 14 cents per kWh. For a four-person household with a daily hot water consumption of approximately 40 to 60 liters per person, the savings add up to several hundred euros annually.

The heating element works particularly efficiently in combination with a PV system of 3 kWp or more . From this system size, a surplus of energy is regularly generated in summer, which can be almost entirely converted into hot water. Even on sunny days in spring and autumn, you benefit from solar heat generation and reduce the use of your conventional heating system.

Key performance data for the heating element for buffer storage tanks

Choosing the right immersion heater for your buffer tank depends on three factors: the size of your PV system, your daily hot water demand, and the volume of your existing storage tank. my-PV offers models with power outputs from 2 to 9 kW, suitable for different household sizes and requirements. The following overview highlights the key technical differences.

The DC ELWA is particularly suitable for existing systems, as it operates independently of the mains electricity supply. Solar modules are connected directly, and the integrated MPPT controller automatically optimizes the yield. For households with a buffer storage tank of 300 liters or more, the AC ELWA 2 or the AC-THOR with a nominal output of 3 to 9 kW are recommended.

A proven rule of thumb applies to sizing: approximately 50 to 80 liters of storage volume are required for every 1 kW of heating element output. A 200-liter buffer tank is therefore ideally suited to the 2 kW DC ELWA, while a 500-liter tank can utilize the full capacity of the AC-THOR 9s. PVundSO will be happy to advise you on the right combination for your specific situation.

Photovoltaic heating element and conventional heating in combination

A photovoltaic immersion heater acts as an intelligent supplement to your existing heating system. In summer, it takes over the entire hot water supply, while in the transitional seasons it significantly reduces your heating system's fuel consumption. The conventional system only kicks in when solar power is insufficient. This noticeably reduces your annual gas or oil consumption and increases the efficiency of your PV system.

Installation in the existing buffer tank is straightforward. The heating element is inserted via the standard 1,5-inch screw-in flange, which most tanks come with as standard. In AC-coupled systems, a hybrid inverter automatically manages the energy distribution between household electricity, battery storage, and heat generation. This allows you to achieve maximum self-consumption without manual intervention.

In the long term, your entire building technology benefits from this expansion. The conventional heating system runs for fewer hours and wears out more slowly. At the same time, the self-consumption rate of your PV system increases to 60 to 80%, which significantly improves the overall cost-effectiveness of the solar investment. Especially with rising energy prices, the combination of photovoltaics and thermal storage is becoming increasingly important for homeowners.

Personal support when purchasing an immersion heater for buffer tanks

PVundSO is headed by managing directors Dirk Garve and Michael Westphal, both qualified electrical engineers with many years of experience in building automation and photovoltaics. This expertise is directly incorporated into their personalized consultations. Whether you have questions about the right power output level, compatibility with your storage tank, or the optimal module combination, at PVundSO you'll reach competent contacts instead of anonymous call centers.

In addition to nationwide online shipping, PVundSO offers a pickup point in Hildesheim (Rex-Brauns-Str. 12a) where you can collect your order in person. Shipping is free for orders over €100. Over 2.900 customer reviews with an average rating of 4,97 out of 5 stars demonstrate the high level of satisfaction among previous customers.

Individual custom orders and special requirements are also part of PVundSO's service portfolio. If your project has specific requirements, the team will develop a suitable solution. Contact us by phone, email, or WhatsApp for a free consultation regarding your heating element for buffer tanks.