What Thermal Energy does

Thermic Energy RZ GmbH (legal name; marketed as Thermic Energy) is a German specialty manufacturer of thermal energy storage systems, headquartered in Borna, Saxony, and operating as a privately held GmbH under managing directors Burkhard Maier and Melis Turhan. The company designs and produces a portfolio of buffer storage tanks (EPS, SPS, SKS product families), drinking water storage tanks in enameled and stainless steel (AISI 316L) variants, heat-pump-specific combination storage (WPKS, WP-TWS, WPDS, WP-KPS), high-performance tanks (HL-TWS), and bespoke Sonderspeicher configured to customer specifications. Manufacturing is fully in-house at the Borna facility, covering stamping, laser cutting, metal rolling, robotic welding, enameling, and factory-foamed PU/HVI composite insulation — the latter enabling EU Energy Efficiency Class A compliance across the standard product range. Differentiated technical components include proprietary stainless steel corrugated tube heat exchangers (Edelstahlwellrohr), integrated stratification baffle devices (Schichtleiteinrichtungen), and Emaillierung process know-how.

The company monetizes its offering through one-time hardware sales — via its own WooCommerce webshop and a regional installer/distributor network concentrated in Germany and the broader DACH region — rather than via subscription or recurring service contracts. Its core customer segments are solar thermal installers, heat pump system providers, and HVAC/plumbing installers, with a secondary channel to end-use residential and commercial customers and a request-form-based custom configuration path for non-standard projects. Through a core technology partnership with my-PV GmbH, Thermic Energy bundles PV-integrated heating electronics (ELWA, AC ELWA 2, AC-THOR 9s, WiFi METER) intended to lift household PV self-consumption from roughly 30% to 75–85% without battery storage, broadening the value proposition beyond passive storage into active energy management. Certifications are brand-anchored on "Made in Germany" quality and on DEKRA, DIN CERTCO, DIN-geprüft, and VdZ validations.

Name

Thermal Energy

Legal name

Thermic Energy RZ GmbH

Website

https://thermic-energy.com

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

51–100 employees

Short description

Thermic Energy RZ GmbH is a German manufacturer of thermal energy storage tanks — buffer, drinking water, combination, and heat-pump-specific storage — plus custom tanks and PV-integrated heating electronics, sold primarily to installers and DACH-region heating-system integrators.

Ownership category

akta.pro rank

Product category

Thermal Energy Storage Equipment

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (333415)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

Cold Chain & Temperature-Controlled Storage Equipment (IMAHAKAJ)

Keywords

• Thermal energy storage
• Buffer storage tanks
• Drinking water storage
• Solar thermal systems
• Heat pump storage

Headquarters

HQ city

Borna

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Infrastructure, Marketing or Sales, Technology or R&D

Revenue model

1. Hardware Sales — Thermal Storage Tanks: Primary revenue stream from the manufacture and sale of buffer storage tanks (Puffer-Speicher), drinking water storage tanks (Trinkwasser-Speicher), combination storage (Kombi-Speicher), and specialized/custom storage solutions. Products are sold directly through the company's WooCommerce e-commerce platform and through regional distribution channels across Germany. Revenue is one-time (per unit) with no recurring subscription component.
2. Accessories and Spare Parts Sales: Secondary revenue stream from sale of storage accessories including heat exchangers, flanges, insulation sets, feet, anodes, thermometers, fresh water stations (FriWa, tubra-FRISTA KL), pipe modules, circulation sets, and extension sets. Also includes replacement plate heat exchangers for fresh water stations.
3. Electrical Heating Elements Sales: Revenue from sale of electric heating elements including Electroheizeinsatz 1½" AG (2–12 kW), flange heaters, special heating rods (9 kW for AC-THOR 9s), ELWA, AC ELWA 2, AC-THOR 9s power manager, and WiFi METER energy monitor. These products are designed for integration with PV systems and storage tanks.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Thermic Energy RZ GmbH manufactures thermal energy storage tanks — buffer storage (Puffer-Speicher), drinking water storage (Trinkwasser-Speicher), combination storage (Kombi-Speicher), and custom-configured special storage (Sonderspeicher) — for solar thermal, heat pump, photovoltaic, and conventional heating systems. The portfolio is complemented by fresh water stations, electric heating elements, PV-integration power managers (ELWA, AC ELWA 2, AC-THOR 9s, WiFi METER), and a wide range of storage accessories, all produced at the company's vertically integrated facility in Borna, Germany.

Product overview

Thermic Energy RZ GmbH is a German manufacturer of thermal energy storage systems and related products. The product portfolio centers on buffer storage tanks (Puffer-Speicher) and drinking water storage tanks (Trinkwasser-Speicher) available in stainless steel and enameled variants, with configurations including no heat exchangers (0W), single heat exchangers (1W), double heat exchangers (2W), and high-performance heat exchangers. Supporting products include fresh water stations (FriWa, tubra-FRISTA KL) for instantaneous drinking water heating, electric heating elements and PV integration products (ELWA, AC ELWA 2, AC-THOR 9s, WiFi METER) for using excess solar energy, and comprehensive accessories including insulation, heat exchangers, circulation sets, anodes, and flange components. Custom storage tanks (Sonderspeicher) can be configured to customer specifications. The company also offers Solarthermie (solar thermal) and Photovoltaik products.

Differentiator

Problem solved

Functional benefit

Products and services

• Energie-Puffer-Speicher (EPS) — Buffer Storage Tanks Energy buffer storage tanks (EPS / EPS-1W / EPS-2W) without or with one or two smooth-tube heat exchangers, ranging from 120 L to 5,000 L, for closed hot water heating systems and large solar installations. Designed for installers and heating contractors needing hydraulic separator and buffer volume in residential and commercial heating circuits.
• Schicht-Puffer-Speicher (SPS) — Layered Buffer Storage Tanks Layer buffer storage tanks (SPS / SPS-1W / SPS-2W) featuring integrated stratification baffle systems (Schichtleiteinrichtungen) for optimal temperature layering and energy storage efficiency, in 0W, 1W, and 2W smooth-tube heat exchanger configurations. Suited for solar thermal and heat pump installers seeking stratified buffer volume.
• Schicht-Kombi-Speicher (SKS) — Layered Combination Storage Tanks Layer combination storage tanks (SKS / SKS-1W / SKS-2W) integrating Schichtleiteinrichtungen stratification baffles with a high-quality Edelstahlwellrohr stainless steel corrugated tube (AISI 316L) for legionella-free drinking water heating, combined with 1-Glattrohr heat exchangers for solar integration. Available in 0W, 1W, and 2W configurations for solar thermal, heat pump, and combined system installers.
• Wärmepumpen-Kombi-Speicher (WPKS) — Heat Pump Combination Storage Heat pump combination storage tanks (WPKS / WPKS-1W) with stainless steel corrugated tube for legionella-free drinking water heating and low-flow-temperature operation. Engineered for residential and commercial heat pump installers needing optimized cycling buffer volume and integrated domestic hot water preparation.
• Wärmepumpen-Klein-Pufferspeicher (WP-KPS) — Compact Heat Pump Buffer Storage Compact heat pump buffer storage tanks specially designed for heat pump operation in confined residential installation spaces, providing optimized buffer volume for heat pump cycling where standard tank dimensions are impractical.
• Puffer-Trinkwasser-Speicher (PTS) — Buffer Drinking Water Storage Buffer drinking water storage tanks (PTS-1W) with one smooth-tube heat exchanger and an integrated drinking water tank section, finished with removable 120 mm GREEN LINE insulation for enhanced energy efficiency. Suited for installations requiring combined buffer and DHW storage in a single tank footprint.
• SPS-1W FriWa — Layer Buffer Storage with Integrated Fresh Water Station Layer buffer storage tank with one smooth-tube heat exchanger combined with an integrated FriWa fresh water station and VFS Direct Sensor controller housed behind a plastic cover, delivering instantaneous legionella-free drinking water heating. Targeted at installers and end customers needing a compact combined buffer-and-DHW package.
• Edelstahl-Trinkwasser-Speicher (EDS) — Stainless Steel Drinking Water Storage Stainless steel drinking water storage tanks (EDS-1W / EDS-2W) made from AISI 316L (EN 1.4404) with one or two smooth-tube heat exchangers, designed for high-quality drinking water storage with maximum hygiene. Targeted at installers and end customers requiring premium stainless construction.
• Trinkwasser-Speicher (TWS) — Enameled Drinking Water Storage Enameled drinking water storage tanks (TWS-1W / TWS-2W / TWS-2W compact) with one or two smooth-tube heat exchangers and factory-fitted PU or HVI composite foam insulation. Particularly effective for solar installations and widely used by heating and plumbing installers in standard residential DHW applications.
• Hochleistungs-Trinkwasser-Speicher (HL-TWS) — High-Performance Drinking Water Storage High-performance drinking water storage tanks (HL-TWS-1W / HL-TWS-2W) featuring double-wound high-performance heat exchangers, with optional second smooth-tube heat exchanger for heat pump combinations. Targeted at commercial-scale DHW demand and high-performance solar thermal installations.
• Wärmepumpen-Trinkwasser-Speicher (WP-TWS / WPDS) — Heat Pump Drinking Water Storage Heat pump drinking water storage tanks (WP-TWS-1W / WPDS heat pump double storage) with large smooth-tube heat exchangers and integrated buffer storage sections, engineered for heat pump cycling, condensing boilers, and combined heat pump + DHW installations.
• PV-Trinkwasser-Speicher (PVT) — PV Drinking Water Storage PV drinking water storage tanks (PVT-1W) with smooth-tube heat exchanger, specially developed for use with photovoltaic systems and PV heating elements such as ELWA, AC ELWA 2, and AC-THOR 9s. Targeted at PV installers and end customers seeking solar-direct water heating.
• Trinkwasser-Ladespeicher (TLS) — Drinking Water Charging Storage Drinking water charging storage tanks (TLS) without integrated heat exchangers, suitable for use with drinking water transfer stations and external heating sources. Targeted at commercial installations requiring a dedicated DHW charging buffer.
• Thermen-Unterstell-Trinkwasser-Speicher (TU-TWS) — Compact Undershelf Drinking Water Storage Compact undershelf standing drinking water storage tanks (TU-TWS-1W) with all system connections located at the top of the unit, designed to be installed directly beneath a wall-hung boiler (Therme). Targeted at residential heating replacements and new builds where vertical clearance is limited.
• Sonderspeicher — Custom-Configured Storage Solutions Custom-configured special storage tanks built to customer specifications, including capacity, insulation, coating, dimensions, connection configurations, and specialized heat exchanger arrangements. Configured via an online request form on the Sonderspeicher page yielding a formal quotation. Suited for non-standard building requirements, custom dimensions, cold storage, or unusual connection layouts.

Quantifiable outcome

• PV self-consumption increases from ~30% to up to 75% in average households with 5 kWp PV installation using AC ELWA 2
• +3 more outcomes

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Feature11 records

Partnerships

Two partnerships are on record, tiered core and minor.

• my-PV GmbHcoreTechnology or IntegrationThermic Energy integrates my-PV products (ELWA, AC ELWA 2, AC-THOR 9s, WiFi METER) into its storage tank ecosystem. These products are featured prominently on the Thermic Energy website as official accessories. The ELWA is an off-grid PV surplus water heating device; the AC ELWA 2 is a grid-connected PV surplus hot water system; the AC-THOR 9s is a PV power manager controlling up to 3 heat sources; the WiFi METER analyzes energy flows and communicates with these controllers. The partnership enables Thermic Energy to offer complete PV-integrated heating solutions.
• Atlantic GroupminorOthersThe Atlantic Group brand is displayed on the Thermic Energy website footer as a partner/branding association. The nature of the Atlantic Group relationship is not fully detailed but appears to be a corporate branding or group affiliation.

Scale indicators2 records

Recent moves5 records

Expansion highlights6 records

Emerging players

• my-PV GmbH: my-PV is the Austrian manufacturer of ELWA, AC ELWA 2, AC-THOR and WiFi METER PV-surplus heating devices that are integrated into Thermic Energy's storage tank bundles. It is the closest technology partner and adjacent competitor in PV-driven water heating solutions marketed to residential PV and heat pump installers.

Broad incumbents

• Vaillant Group: Vaillant is a major German heating, heat pump, and hot water system manufacturer offering integrated heating solutions including buffer and DHW storage tanks. Comparable to Thermic Energy as an established heating-systems incumbent serving the same DACH installer base with overlapping thermal storage product lines.
• Bosch Thermotechnik (Buderus, Junkers, Wolf): The Bosch Thermotechnology division markets Buderus, Junkers, and Wolf brands for boilers, heat pumps, and DHW/buffer storage across Europe. Comparable to Thermic Energy as a competing supplier of quality-certified storage tanks and heating system components to DACH installers.
• Wolf GmbH (Bosch): Wolf is a German heating-systems brand offering boilers, heat pumps, and storage tanks for residential installations. Overlaps with Thermic Energy in providing integrated heating-system storage solutions to DACH installers.
• Stiebel Eltron: Stiebel Eltron manufactures heat pumps, hot water storage tanks, and DHW heating systems in Germany with a strong installer and end-customer channel. Its warm-water and buffer storage products overlap directly with Thermic Energy's Trinkwasser-Speicher and Puffer-Speicher ranges for residential and light commercial heating.
• Cordivari S.r.l. Cordivari is an Italian manufacturer of buffer, combi, and DHW storage tanks for heating and renewable energy systems with EU-wide distribution. Comparable to Thermic Energy as a specialised storage-tank producer competing in the same EU Ecodesign-driven tank market.
• Elbi S.p.A. (Ariston Group): Elbi, part of the Ariston Group, produces electric water heaters and DHW/buffer storage tanks sold across Europe. Comparable to Thermic Energy in manufacturing comparable storage cylinders but with much broader geographic reach and group-level scale.
• Viessmann (Carrier): Viessmann is one of the leading international manufacturers of heating, industrial and refrigeration systems, with a broad portfolio of buffer storage, combi tanks, and drinking water cylinders comparable to Thermic Energy's EPS/SPS/SKS/WPKS families. Both serve German-speaking markets with quality-certified, Ecodesign-compliant products.

Direct peers

• Reflex Winkelmann: Reflex is a German specialist in membrane expansion vessels, pressure maintenance, and thermal storage tanks for heating and cooling systems. Like Thermic Energy, Reflex manufactures tank-based components for installer channels and competes in buffer and drinking water storage for heat pump and solar applications.
• TUXHORN GmbH & Co. KG: TUXHORN is a German manufacturer of enamelled buffer storage and drinking water storage tanks in a comparable size and product focus to Thermic Energy. Both are specialist Mittelstand manufacturers serving installers in Germany with customisable storage solutions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/thermic.energy

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thermal Energy