heimWatt
heimWatt GmbH is a German direct-to-customer renewable energy installer offering turnkey PV, heat pumps, battery storage, EV wallboxes and its proprietary smartY HEMS, primarily serving residential homeowners across northern and western Germany.
- Company typePrivate
- Founded2020
- HeadquartersSalzhausen, Germany
- Headcount—
- GTM typeB2B and B2C
- OfferingServices
What heimWatt does
heimWatt GmbH is a German vertically integrated renewable energy installer founded in 2020 and headquartered in Salzhausen, Lower Saxony. The company designs, plans and installs residential and commercial photovoltaic systems, heat pumps, battery storage, EV wallboxes and tenant electricity (Mieterstrom) solutions, primarily for private homeowners in northern and western Germany. Service is delivered through a fully owned direct channel: four offices (Salzhausen HQ, two in Köln, Norderstedt), a regional Infotage/Infoabend event network, and an in-house sales and quoting workflow that delivers customized offers within 48 hours.
The product stack is built around the proprietary smartY Home Energy Management System (HEMS), which orchestrates generation and consumption across PV inverters, batteries (Enphase IQ Battery 5P, Fronius Reserva), WOLF CHA Monoblock air-to-water heat pumps, EV wallboxes, and a dynamic electricity tariff supplied by partner rabot.energy. heimWatt exclusively installs Astronergy N7s n-type TOPCon modules and standardizes on WOLF as its heat pump supplier, where it claims the No. 1 partner position in Germany, having installed more than 800 WOLF heat pumps and 1,200+ PV systems to date. Planning is supported by Aurora Solar LiDAR-based 3D modeling for pre-on-site yield forecasting, and installations carry warranties of up to 25 years on PV modules and 5 years on heat pumps.
Revenue is generated primarily through one-time turnkey installation contracts (typical residential PV system incl. storage €19,000-€35,000 net), complemented by recurring subscription revenue from the dynamic electricity tariff, hardware sales of smartY HEMS, and project-based commercial work starting at 30 kWp. The company handles end-to-end funding applications (BEG/KfW/BAFA) and grid registration, reducing friction for customers. No external funding, headcount or revenue figures are publicly disclosed, and the company is led by three managing directors (Henrik Morgenstern, founder Malte Twesten, Joost Hansen).
heimWatt firmographics
Firmographics- Name
- heimWatt
- Legal name
- heimWatt GmbH
- Website
- https://heim-watt.de
- Company type
- Private
- Founded year
- 2020
- Operating status
- Operating
- Short description
- heimWatt GmbH is a German direct-to-customer renewable energy installer offering turnkey PV, heat pumps, battery storage, EV wallboxes and its proprietary smartY HEMS, primarily serving residential homeowners across northern and western Germany.
- Ownership category
- akta.pro rank
heimWatt industry classification
Industry- Product category
- Residential and commercial solar PV and heat pump installation services
- NAICS
- Solar Electric Power Generation (221114), Electric Power Generation (22111)
- SIC
- Motors & Generators (3621), Electric Services (4911)
- akta.pro primary industry
- Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers) (HSAPAQAF)
- akta.pro secondary industries
- Residential Behind-the-Meter Generation (EUACALAB), Renewable Distributed Generation (Rooftop/Onsite Solar, Small Wind, Small Hydro) (EUACALAJ), Solar Inverters, Power Electronics & MLPE (String/Central Inverters, Optimizers, Microinverters) (EUAMABAE)
Keywords
Where heimWatt is headquartered
LocationHeadquarters
- HQ city
- Salzhausen
- HQ country
- Germany
- HQ region
- Europe
Offices4 records
Markets served
heimWatt business model
Business model- GTM type
- B2B and B2C
- Offering type
- Services
- Cost components
- Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Turnkey PV and heat pump installation: One-time sale of customized photovoltaic systems, heat pumps, batteries, wallboxes and accessories including planning, installation, grid registration and funding-application support. Includes up to 25-year warranty and service packages.
- Dynamic electricity tariff: Recurring revenue from sale of dynamic end-customer electricity tariffs (price follows wholesale market), integrated with smartY HEMS to optimize consumption windows.
- smartY HEMS hardware and software: Sale of proprietary smartY energy manager hardware plus accompanying app; enhances customer lifetime value and enables cross-selling of dynamic tariff and additional services.
- Large-scale commercial and municipal PV projects: Project-based revenue from commercial/industrial, housing-industry and municipal installations (rooftop, ground-mounted, Mieterstrom, charging infrastructure) starting from 30 kWp.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Quote-based turnkey installation package |
| Subscription | Pay-as-you-go | Dynamic electricity tariff subscription |
| Unit Pricing | Pay-as-you-go | PV module unit pricing (industry reference) |
Go-to-market motion1 record
Distribution channels4 records
heimWatt product offering
Product offeringCore offering
heimWatt sells and installs turnkey residential renewable-energy systems combining Astronergy N7s photovoltaic modules, WOLF air-to-water heat pumps, lithium battery storage (Enphase/Fronius), EV wallboxes, and Mieterstrom tenant-supply solutions in Germany. Its proprietary smartY Home Energy Management System orchestrates these hardware components together with a dynamic electricity tariff (via rabot.energy). The company also delivers large-scale commercial and municipal PV projects (≥30 kWp) including rooftop, ground-mounted, storage and EV charging infrastructure.
Product overview
heimWatt offers a modular, integrated renewable-energy platform for residential and commercial customers in Germany rather than a single product. The core portfolio combines five interconnected pillars: solar generation (Photovoltaik with Astronergy N7s modules), heating (Wärmepumpen and Brauchwasser-Wärmepumpen from WOLF), stationary storage (Batteriespeicher from Enphase/Fronius), EV charging (Wallbox), and energy services (Dynamischer Stromtarif and Mieterstrom). These hardware components are orchestrated by the proprietary smartY Home Energy Management System (HEMS), which acts as the software/hardware control layer that monitors, optimizes, and automates energy flows across the entire stack. heimWatt also extends the same platform to PV-Großprojekte for commercial and industrial customers (warehouses, schools, social institutions, housing associations) starting at 30 kWp, including ground-mounted PV, large-capacity batteries, and EV charging infrastructure.
Differentiator
Problem solved
Functional benefit
Brands
- smartY: heimWatt's proprietary Home Energy Management System (HEMS), branded as smartY (also styled smarty), consisting of independent hardware and software that monitors, controls, and optimizes energy flows; available with a dedicated mobile app.
Products and services
- Photovoltaik (Astronergy N7s PV system) Turnkey photovoltaic installations for residential and commercial customers using Astronergy N7s n-type TOPCon monocrystalline modules (450-475 W, 23.8% efficiency, 25-year guarantee). Designed, LiDAR-planned with Aurora Solar, and installed by heimWatt.
- Wärmepumpen (WOLF CHA Monoblock) Air-to-water heat pumps from German manufacturer WOLF (CHA-7/10/16 Monoblock series), R290 refrigerant, A+++ energy class, 34-39 dB(A) night operation. heimWatt is the self-claimed No. 1 WOLF heat pump partner in Germany.
- Brauchwasser-Wärmepumpe (WOLF FHS series) Hot-water-only heat pumps from WOLF (FHS-180 and FHS-280, 166 L / 270 L, COP up to 3.67) that extract up to 75% of thermal energy from ambient air, with SMART-GRID connectivity for PV surplus use.
- Batteriespeicher (Solarstromspeicher) Lithium-ion home battery storage systems (Enphase IQ Battery 5P FlexPhase, Fronius Reserva) integrated with heimWatt PV systems. Typical residential configuration: 10 kWp PV + 10 kWh storage, raising self-consumption to ~46% and autarky to ~72%.
- smartY Home Energy Management System (HEMS) Proprietary heimWatt hardware and software that monitors, controls, and optimizes energy flows across PV, battery, heat pump, wallbox and dynamic tariff. Controlled via iOS and Android mobile apps.
- Wallbox (EV charging) Home EV charging stations (e.g., Vestel Wallbox) integrated with the smartY HEMS for surplus-PV charging optimization.
- Dynamischer Stromtarif Time-varying electricity tariff from heimWatt (partner: rabot.energy) aligned with wholesale market prices, integrated with smartY HEMS to shift loads into low-price windows.
- Mieterstrom (tenant electricity supply) Tenant electricity supply combining rooftop PV, storage, and on-site distribution to tenants in multi-family buildings and social institutions.
- PV-Großprojekte (Commercial / Industrial PV) Large-scale photovoltaic projects (≥30 kWp) for commercial, industrial, housing-association, municipal and social-sector customers, including rooftop PV, ground-mounted PV, Mieterstrom, large-capacity storage and EV charging infrastructure.
Quantifiable outcome
- Installation lead time within 4 weeks once approved
- +5 more outcomes
Companies that use heimWatt
Customer profileNamed customers6 records
Ideal customer profiles2 records
heimWatt technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration6 records
AI capability2 records
Feature4 records
heimWatt partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered flagship, core and minor.
- WOLF GmbHflagshipheimWatt positions itself as the No. 1 WOLF heat pump partner in Germany and prominently displays the WOLF partner seal and "Made in Germany by WOLF" mark. All installed air-to-water heat pumps are WOLF CHA Monoblock units (CHA 7/10/16). WOLF also supplies the Brauchwasser-Wärmepumpen FHS-180 and FHS-280 sold by heimWatt.
- rabot.energycoreheimWatt offers rabot.energy's dynamic electricity tariff to its customers, integrated with the smartY HEMS for time-of-use optimization. Listed as a partner on rabot.energy's partner directory.
- Enphase EnergycoreEnphase is listed as a heimWatt partner for storage solutions, with the IQ Battery 5P Flexphase referenced in the partner logo link to the Enphase store.
- Fronius InternationalcoreheimWatt partners with Fronius for the Fronius Reserva storage system (referenced via partner logo link).
- Astroenergy (Astronergy)coreheimWatt exclusively installs the Astronergy N7s full-black n-type TOPCon PV modules (450–475 W, 23.8% efficiency, 25-year warranty) as its standard solar module offering.
- Bundesverband Wärmepumpe (bwp) e.V.minorheimWatt displays the bwp association logo on its website, indicating industry association membership for heat pump advocacy in Germany.
- BSW Solar (Bundesverband Solarwirtschaft)minorheimWatt displays the BSW Solar association logo on its website, indicating membership in the German solar industry association.
- Aurora SolarcoreheimWatt uses Aurora Solar's professional planning software for LiDAR-based 3D modeling, shading analysis and PV yield forecasting prior to on-site appointments.
- Chip.de / e-FahrerminorLogo displayed on heimWatt homepage linking to Chip.de's e-power test, indicating media/co-marketing relationship for EV and energy products.
Scale indicators8 records
Recent moves6 records
Expansion highlights6 records
heimWatt competitors and assessment
Company assessmentMarket position
Competitive moat5 records
Key highlights6 records
Customer concentration
heimWatt social profiles
Digital presenceheimWatt compliance and trust
Trust signalCompliance4 records
heimWatt financial estimates
Financial estimateRevenue estimate
Valuation estimate
heimWatt leadership team
Management profileNumber of profiles
Profiles5 records
heimWatt funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
heimWatt M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about heimWatt
What does heimWatt do?
heimWatt sells and installs turnkey residential renewable-energy systems combining Astronergy N7s photovoltaic modules, WOLF air-to-water heat pumps, lithium battery storage (Enphase/Fronius), EV wallboxes, and Mieterstrom tenant-supply solutions in Germany. Its proprietary smartY Home Energy Management System orchestrates these hardware components together with a dynamic electricity tariff (via rabot.energy). The company also delivers large-scale commercial and municipal PV projects (≥30 kWp) including rooftop, ground-mounted, storage and EV charging infrastructure.
Is heimWatt a public or private company?
heimWatt is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was heimWatt founded?
heimWatt was founded in 2020.
Where is heimWatt based?
heimWatt is headquartered in Salzhausen, Germany, in the Europe region.
How does heimWatt make money?
Four revenue lines are on record. Turnkey PV and heat pump installation is the primary driver. The others are dynamic electricity tariff, smartY HEMS hardware and software and large-scale commercial and municipal PV projects.
Does heimWatt have an API?
No public API is recorded for heimWatt.
What industry is heimWatt in?
heimWatt's product category is Residential and commercial solar PV and heat pump installation services. Its primary akta.pro industry code is HSAPAQAF, Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers), with a secondary code of EUACALAB, Residential Behind-the-Meter Generation. Its NAICS code is 221114 and its SIC code is 3621.