What Garant Heating Systems Engineering Company does

Garant Heating Systems Engineering Company (legal name: GARANT Wärmesysteme Ingenieurgesellschaft mbH) is a privately held German Mittelstand building-services engineering firm founded in 2004 in Glauchau, Saxony, and led by managing directors Holger Voigtmann and Danilo Voigtmann. The company plans, installs, and maintains heating, sanitary, ventilation, and air-conditioning (HLS) systems for private homeowners, commercial/real-estate developers, and public-sector clients, operating nationwide from two wholly-owned locations in Glauchau (HQ) and Munich/Putzbrunn (established 2010 as GARANT Wärmesysteme München GmbH) with a workforce of 75-80+ trained engineers and craftsmen.

The core technology stack is conventional building-services engineering (HLS — Heizung/Lüftung/Sanitär) integrated with renewable energy systems, including individualized heat-pump design, photovoltaic and energy-storage integration, and pellet-heating systems. A distinguishing offering is the mobile heating container (50-270 kW, 500-750 liter tank capacity) for construction-site or emergency temporary heat. Through a 2024 strategic partnership with Sweden-based Aira, the company now also offers heat-pump installations under a no-upfront-cost monthly payment plan, with a 30-day order-to-installation cycle; the corporate identity has been co-branded as "GARANT Aira Wärmesysteme."

Revenue is generated primarily through project-based contracts (typical range ~€5,000 for small residential jobs up to ~€4.3M for large multi-unit residential developments), with supplementary recurring streams from customized maintenance contracts (Wartungsverträge), 24/7 emergency service in the Glauchau region (7 days/week, 7-22 hours), and mobile heating container rental. Customers are acquired via direct sales (phone, email, website contact forms), supplemented by an inbound heating-cost calculator on the website, plus organic social (Facebook, Instagram) and SEO. Notable customers in the reference base include housing developers in Höhenkirchen and Munich, a rehabilitation center in Glauchau, and public-sector projects (Pestalozzi-Oberschule, a Pfaffenhain fire station). The company won the Sächsischer Gründerpreis (Saxon Founder's Prize) in 2006.

Name

Garant Heating Systems Engineering Company

Legal name

GARANT Wärmesysteme Ingenieurgesellschaft mbH

Website

https://garant-glauchau.eu

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

51–100 employees

Short description

Garant Heating Systems Engineering Company is a privately held German Mittelstand building-services firm that plans, installs, and maintains heating, sanitary, ventilation, and air-conditioning systems for private, commercial, and public-sector clients across Germany, operating from Glauchau and Munich with 75-80+ in-house engineers and craftsmen.

Ownership category

akta.pro rank

Product category

HVAC and Building Services Engineering

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Steam & Air-Conditioning Supply (4961), Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro primary industry

Residential HVAC System Installation (Furnace/AC/Heat Pump) (HSAOAGAA)

akta.pro secondary industries

Boiler & Hydronic Heating System Installation (HSAOAGAF), Heat Pump Repair & Maintenance (HSAOAHAD), Boiler & Hydronic Heating Repair & Service (HSAOAHAG), Expansion Tank, Circulator Pump & Zone Valve Service (HSAOACAG)

Keywords

• HVAC installation services
• Heat pump systems
• Building services engineering
• Plumbing heating ventilation
• Sanitary installation services

Headquarters

HQ city

Putzbrunn

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Planning, Installation & Execution Services: One-time project-based revenue from the planning, installation, and execution of heating, sanitary, ventilation, and air conditioning systems. Revenue is recognized per project with contract sums ranging from approx. €5,000 (small residential) to €4.3 million (large commercial new-builds).
2. Maintenance and Service Contracts: Recurring revenue from individually tailored maintenance contracts (Wartungsverträge) covering heating, climate, and sanitary systems. Customers can request contracts via an online form or direct inquiry.
3. Emergency Repair and After-Hours Service: Revenue from emergency service (Notdienst) calls, where technicians are available 7 days a week from 7–22 hours in Glauchau and surrounding area to address heating failures and pipe leaks.
4. Mobile Heating Container Rental: Rental income from mobile heating containers offered in various performance levels (50–270 kW) for temporary heating needs on construction sites or during facility emergencies.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Garant Heating Systems Engineering Company plans, installs, and maintains heating, sanitary, ventilation, and air conditioning systems for private, commercial, and public-sector clients across Germany. The portfolio covers heat pumps, conventional heating, photovoltaics, energy storage, pellet heating, plumbing, and HVAC, delivered as full-lifecycle projects with in-house engineering and execution teams. Supplementary offerings include customized maintenance contracts, 24/7 emergency repair service, and rental of mobile heating containers for temporary or construction-site needs.

Product overview

GARANT Wärmesysteme Ingenieurgesellschaft is a medium-sized building technology company offering a comprehensive, integrated portfolio of HVAC (heating, ventilation, air conditioning) and sanitary services. The core offering spans heat pumps, conventional heating systems, photovoltaics, pellet heating, plumbing, and ventilation/air conditioning — all planned, installed, and maintained by the company's own engineers and technicians. The company serves private, commercial, and public clients nationwide through two locations (Glauchau and Munich), with an additional focus on mobile heating containers for temporary/emergency needs. A partnership with Aira extends access to smart heat pump financing and installation, though Aira itself is not a product of Garant.

Differentiator

Problem solved

Functional benefit

Products and services

• Heat Pump Systems (Wärmepumpen)
• Heating Systems (Heizung)
• Photovoltaic Systems (Photovoltaik)
• Pellet Heating Systems (Pelletheizung)
• Sanitary and Plumbing Services (Sanitär)
• Ventilation and Air Conditioning (Lüftung / Klima)
• Commercial HVAC Services (Heizungs-, Sanitär- und Lüftungsgewerke für Gewerbe)
• Mobile Heating Containers (Mobile Heizcontainer)
• Customer Service and Emergency Service (Kundendienst / Notdienst)
• Maintenance Contracts (Wartungsverträge)

Quantifiable outcome

• Up to 75% CO₂ reduction with intelligent heat pumps; up to 100% when combined with solar/fossil-free electricity
• +2 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• AiracoreStrategic or Co-development Partner · 1 January 2024Aira, a Swedish company specializing in AI-powered heat pumps and clean energy technology, partnered with Garant to expand heat pump installation reach in Germany. Aira contributes financing solutions (monthly payment plans with no upfront costs), while Garant provides installation expertise, planning, and solar panel integration capabilities. The partnership is intended to accelerate Germany's transition to renewable heating under the Gebäudeenergiegesetz (GEG), with Aira targeting 1 million heat pump installations in Germany over 10 years. Garant is presented as an ideal partner due to its expertise in renewable energy solutions, digitalization, and its team of over 80 experts in Glauchau and Munich.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• Vaillant Deutschland: Remscheid-based heating, ventilation, and heat-pump manufacturer with a large German installer network. Comparable on the heat-pump and heating-system categories where Garant provides installation service; broader incumbent with national brand pull.
• Stiebel Eltron: Holzminden-based specialist in heat pumps, hot-water systems, and ventilation. Strongly comparable on the heat-pump product category Garant is scaling via the Aira partnership, though positioned as a manufacturer rather than installer.
• Bosch Thermotechnik (Buderus): German heating/HVAC manufacturer (Buderus, Junkers brands) operating a national installer-partner network. Comparable as the supply-side counterpart to Garant's installation business, with major share in residential boiler and heat-pump replacement projects.
• Viessmann: Allendorf-based manufacturer of heating, industrial and refrigeration systems including a strong heat-pump portfolio. Comparable as the dominant German heating-systems incumbent that installers like Garant specify and install; overlaps on heat-pump, boiler, and renewable-energy categories.

Direct peers

• Gegenbauer Gruppe: Berlin-headquartered technical building services and facility management group offering HVAC installation, plumbing, and energy-system services across Germany. Directly comparable in scope to Garant's heating/sanitary/ventilation offering, though at significantly larger scale and broader geographic coverage.
• ENGIE Deutschland: Major German facility-services and technical building-management provider with significant HVAC installation and energy-transition service lines. Comparable on integrated heating, climate, and renewable-energy offerings, though at multi-national scale.
• GA-tec Gebäude- und Anlagentechnik GmbH: German mid-sized HVAC and building-services contractor serving commercial and residential clients. Closest scale-comparable peer to Garant on combined heating, plumbing, ventilation, and air-conditioning installation plus maintenance contracts.
• SPIE Deutschland & Zentraleuropa: One of Germany's largest multi-technical building services contractors with a dedicated HVAC/Heating division. Comparable to Garant on building-services trade contracting and recurring maintenance, with substantially deeper resources and broader geographic reach.
• Wisag: Frankfurt-based facility services and building technology group covering HVAC, sanitary, and electrical trades. Directly comparable trade contractor footprint with stronger service-contract density across German commercial real estate.

Emerging players

• Aira: Swedish clean-energy-tech company offering AI-driven heat pumps with integrated financing; explicitly partnered with Garant for German installations. Comparable as a heat-pump player entering the same customer segment via a service-plus-financing model, but as Garant's partner rather than competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/Garant-W%C3%A4rmesysteme-Ingenieurgesellschaft-mbH-1582826975360154
• Instagraminstagram.com/garant_glauchau

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries2 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 Garant Heating Systems Engineering Company