Bonarius
Bonarius is a Dutch HVAC services company that designs, installs, and maintains central heating, heat pumps, and ventilation systems for over 270,000 installations, primarily serving housing corporations under long-term TCO contracts via its proprietary BOA remote monitoring platform and Zwerm swarm maintenance methodology.
- Company typePrivate
- Founded1955
- HeadquartersZwanenburg, Netherlands
- Headcount251–500
- GTM typeB2B
- OfferingServices
What Bonarius does
Bonarius Bedrijven B.V. is a Dutch HVAC services company founded in 1955 as a family business and headquartered in Zwanenburg, Netherlands. Through its two operating subsidiaries, Bonarius Techniek B.V. (installation design and execution) and Bonarius Service B.V. (maintenance and management), the company maintains and installs central heating systems, hot water appliances, heat pumps, and heat-recovery ventilation (WTW) systems, managing over 270,000 CV installations for Dutch housing corporations, healthcare providers, schools, property managers, and VVE homeowner associations. Its service delivery rests on three operational pillars: (1) the proprietary BOA (Bonarius Op Afstand) remote monitoring platform that wirelessly reads boiler telemetry and auto-generates work orders, (2) the "Zwerm" swarm methodology in which teams of 30-70 technicians service up to 300 homes per day, and (3) long-duration Total Cost of Ownership contracts (e.g., an 18-year agreement with Rochdale covering 24,000 ketels). Pricing is a mix of subscription-based service contracts (BASIS at €100.15/year and TOP at €254.75/year for individuals), one-time installation fees, and managed-service TCO agreements with enterprise clients. The company operates from four regional offices (Zwanenburg, Den Haag, Utrecht, Zwolle) and an Arnhem branch, covering western and central Netherlands.
In November 2025 Bonarius was acquired by UK-based Sureserve, ending 70 years of independent Van Heusden family ownership and marking Sureserve's first international expansion; Sureserve itself has been backed by private equity firm Cap10 Partners since July 2023. Bonarius is positioned at the intersection of regulated installation work (it holds the first Dutch BRL6000-25 Gasketelwet certification, plus STEK, BRL6000-21, BRL6010, Kiwa CO-preventie, and VCA certifications) and the Dutch housing-stock sustainability transition, evidenced by hybrid heat-pump deployments (500+ units at Bouwinvest's Duurzaam Diemen), a one-day WTW installation system co-developed with Zehnder, and in-house technician training through Bonarius Academy in partnership with ROC Amsterdam.
Bonarius firmographics
Firmographics- Name
- Bonarius
- Legal name
- Bonarius Bedrijven B.V.
- Website
- https://bonarius.com
- Company type
- Private
- Founded year
- 1955
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Short description
- Bonarius is a Dutch HVAC services company that designs, installs, and maintains central heating, heat pumps, and ventilation systems for over 270,000 installations, primarily serving housing corporations under long-term TCO contracts via its proprietary BOA remote monitoring platform and Zwerm swarm maintenance methodology.
- Ownership category
- akta.pro rank
Where Bonarius is headquartered
LocationHeadquarters
- HQ city
- Zwanenburg
- HQ country
- Netherlands
- HQ region
- Europe
Offices4 records
Markets served
Bonarius business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Supply Chain
Revenue model
- Service & Onderhoud: Preventive and corrective maintenance services for CV installations through annual service contracts. Includes remote monitoring via BOA system, scheduled maintenance visits, and 24/7 emergency repair services.
- Montage & Installatie: Installation and replacement of CV-ketels, heat pumps, WTW systems, and complete heating systems for housing corporations and private individuals. Includes large-scale renovation projects.
- TCO-contracten: Long-term Total Cost of Ownership contracts spanning 18 years, covering complete maintenance and replacement of all CV installations in housing corporation portfolios (e.g., 24,000 ketels for Rochdale).
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Annual | BASIS Service Contract - Annual maintenance with pechhulp (emergency assistance) |
| Subscription | Monthly | TOP Service Contract - All-inclusive for Remeha, Intergas, Nefit, AWB, ATAG |
| Unit Pricing | Pay-as-you-go | Individual CV-ketel replacement |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
Bonarius product offering
Product offeringCore offering
Bonarius maintains, installs, and remotely monitors central heating (CV) systems, hot water appliances, hybrid heat pumps, and heat recovery ventilation (WTW) installations, primarily under long-term service and TCO contracts with Dutch housing corporations and institutional clients. Through its proprietary BOA remote monitoring system and Zwerm large-scale maintenance methodology, the company manages over 270,000 individual CV installations and serves both B2B portfolio clients (housing corporations, healthcare, education, VVE's, property managers) and a limited base of private individuals.
Product overview
Bonarius is a Dutch HVAC services company operating through two main divisions: Bonarius Techniek (design and installation for new construction and renovation projects) and Bonarius Service (maintenance and management of existing installations). The company manages over 270,000 CV installations using its proprietary BOA remote monitoring platform, which enables predictive maintenance based on real-time boiler data. Service delivery is enhanced by 'De Zwerm' methodology - large teams performing preventive maintenance across 300+ homes daily. For residential customers, Bonarius offers BASIS and TOP service contracts covering all brands. The company also specializes in sustainable solutions including hybrid heat pumps and heat recovery ventilation (WTW) systems. All technicians are trained through the in-house Bonarius Academy.
Differentiator
Problem solved
Functional benefit
Brands
- Bonarius Op Afstand (BOA): Remote monitoring system for CV installations using proprietary software that monitors performance, maintenance status, and potential malfunctions of individual boilers wirelessly without invading resident privacy
- De Zwerm (The Swarm)
- Bonarius Academy
Products and services
- Bonarius Service (Maintenance & Management) Long-term management and preventive/corrective maintenance of more than 270,000 CV installations for housing corporations and institutional clients, including 24/7 emergency service and remote monitoring via the BOA system.
- Bonarius Techniek (Installation Projects) Design and execution of installation engineering for large-scale new construction and renovation projects, including combined hot water and central heating installations, electrical installations, and sustainable installations such as heat pumps and solar panels.
- Bonarius Op Afstand (BOA) remote monitoring Proprietary wireless remote monitoring platform for CV boilers forming a meshed network between devices, with anomaly detection on water pressure, error codes, and operational hours that automatically generates work orders to enable predictive maintenance based on actual boiler condition.
- De Zwerm (Swarm) large-scale maintenance methodology Large-scale neighborhood maintenance service deploying teams of 60+ technicians with on-site quality controllers and mobile supply trucks to perform preventive maintenance on up to 300 homes per day, or complete boiler replacements on 20 homes per day.
- Hybrid Heat Pump Installations Hybrid air-water heat pumps combined with HR CV systems, designed for sustainable heating of existing buildings. Delivered as turnkey installations with monitoring via Energievolutie for performance benchmarking across brands.
- WTW (Heat Recovery Ventilation) Installations Heat Recovery Ventilation installations jointly developed with Zehnder that improve indoor air quality while recovering thermal energy, using a proprietary one-day installation methodology with reversed ventilation patterns for improved bedroom air quality.
- Ketel Vervanging (Boiler Replacement) Complete turnkey boiler replacement service covering removal of the old unit, installation of a new Remeha, Intergas, Nefit, Daikin, Vaillant, or ATAG boiler, flue gas system replacement, and quality inspection, completed within one day per home.
- BASIS Service Contract Annual maintenance contract for CV systems of all brands priced at €100.15 per year, including an annual maintenance visit and 24/7 emergency hotline with no call-out fees; customers pay only labor and parts. Optional add-ons for MV service (€69.15/year) and WTW service (€116.85/year).
- TOP Service Contract All-inclusive monthly/annual maintenance contract exclusively for Remeha, Intergas, Nefit, AWB, and ATAG boilers, priced at €254.75 per year or €22.00 per month, covering all labor, parts, and call-out fees.
- TCO (Total Cost of Ownership) Contracts Long-term multi-year Total Cost of Ownership contracts (up to 18 years) covering complete maintenance and replacement of all CV installations in housing corporation portfolios, including the landmark 24,000-ketel Rochdale contract.
Quantifiable outcome
- Up to 80% gas savings with hybrid installations (Diemen project)
- +6 more outcomes
Companies that use Bonarius
Customer profileNamed customers9 records
Segments6 records
Ideal customer profiles3 records
Bonarius technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability2 records
Feature3 records
Bonarius partnerships and signals
Strategic signalPartnerships
Twelve partnerships are on record, tiered minor and core.
- PortaalminorSuccessful pilot project reducing WTW installation time from 3 days to 1 day. Developed new installation methodology with Zehnder including reversed ventilation patterns for improved air quality.
- ZehndercoreTechnology partnership for WTW systems. Jointly developed innovative one-day installation methodology. Bonarius works exclusively with Zehnder for heat recovery ventilation in pilot projects.
- BouwinvestcoreSustainability partnership on Paris-proof real estate. Project Duurzaam Diemen with 500+ hybrid heat pumps in 11 complexes. Bouwinvest invests heavily in energy-efficient buildings. Bonarius handles installation, maintenance and monitoring of hybrid systems.
- Woonwaard Noord-KennemerlandminorSustainability pilot installing 6 different types of hybrid heat pumps in existing homes to compare performance, costs, and resident experiences. Monitoring via Energievolutie system.
- De AlliantiecoreComprehensive smoke exhaust inventory project for 17,000 homes. Developed online platform with app and database for maintenance planning. Bonarius conducts full inspection and risk analysis with investment indications for 5, 10 and 15 year maintenance planning.
- DudokcoreOVT replacement project for approximately 350 homes with goal to complete by 2019. Uses intensive resident approach similar to Rochdale. Working in 365-sharepoint environment for documentation.
- Stichting Ouderenhuisvesting Rotterdam (SOR)minorComplete CV installation replacement for Rubroek senior complex with 198 apartments. Installed 4 Atag Trigion HR boilers with cascade system, replaced 500 thermostatic valves. Achieved 50%+ power capacity reduction.
- Idea Nederland BVminorEngineering consultancy for Rubroek project, collaborated on heat demand analysis and optimization to achieve maximum energy savings.
- RochdalecoreLong-term TCO contract for maintenance of 24,000 CV ketels over 18 years. Includes Open Verbrandingstoestellen (OVT) replacement project. Major strategic partnership marking changing role of housing corporations as directors outsourcing comfort installations. Rochdale has 24/7 access to BOA data for management information.
- ROC AmsterdamcoreEducational partnership with ROC Amsterdam for Service and Maintenance training program. Bonarius Academy provides classroom in own facility with customized curriculum, saving travel time for technicians.
- HVO QueridominorFull technical service coordination outside office hours for 50+ healthcare locations. Bonarius front office coordinates preferred suppliers for all technical issues (plumbing, electrical, locksmiths, etc.) within 2 hours response time. 150 incidents per year.
- MVGMminorCombined CV maintenance with daily structural maintenance pilot in Diemen-Noord with Bouwinvest. 5-week pilot with multidisciplinary teams (technicians, carpenters, electricians, plumbers) working on 700 homes.
Scale indicators8 records
Recent moves9 records
Expansion highlights6 records
Bonarius competitors and assessment
Company assessmentRegional players
- A.Hak Installatietechniek: Dutch infrastructure and installation contractor with HVAC and heat-network capabilities, primarily serving utilities and regional projects; comparable to Bonarius Techniek on heat-network and MEP installations but with a different customer mix.
Direct peers
- HOMIJ: Dutch technical services and installation provider (part of TBI) specialising in HVAC, electrical and building services for housing corporations and commercial real estate — direct overlap with Bonarius Techniek's new build and renovation work.
- Breman Installatiegroep: Dutch installation group with strong residential HVAC, heat pump and maintenance offerings across multiple regions; comparable to Bonarius on installation plus recurring service for housing portfolios and private homeowners.
- Feenstra: One of the largest Dutch residential HVAC service and maintenance specialists, directly comparable to Bonarius Service for CV-ketel maintenance contracts, boiler replacement and remote monitoring of residential heating installations across the Netherlands.
- Van Dorp Installateurs: Dutch installer providing HVAC, plumbing and electrical services with regional offices; comparable to Bonarius Techniek's installation footprint and growing service/maintenance contracts with housing and commercial clients.
- Comfort Partners: Dutch HVAC services company focused on social housing corporations, offering multi-year maintenance contracts and energy-transition retrofits — closely comparable to Bonarius's housing-corporation GTM and TCO-contract model.
Others
- Sureserve Group: UK-listed property services group that recently acquired Bonarius; operates in social housing maintenance, energy services and compliance — comparable as a strategic peer and now direct parent, sharing the housing-corporation GTM and regulatory-driven service model.
Broad incumbents
- ENGIE Nederland: Major Dutch energy and HVAC services arm of global utility ENGIE, offering heat pump installations, building energy management and maintenance — comparable as a broad incumbent in the same heat-transition space Bonarius is targeting with hybrid heat pumps.
- Unica: Large Dutch multi-disciplinary building services installer covering HVAC, electrical, security and energy solutions — overlaps with Bonarius on heat pump installation and building maintenance but serves a broader customer set including commercial and industrial.
- Croonwolter&dros: Major Dutch technical installer and building services firm with broad HVAC, electrical and maintenance capabilities across commercial, industrial and residential segments; comparable to Bonarius Techniek but with a much wider portfolio and national footprint.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat7 records
Key risks6 records
Key highlights7 records
Customer concentration
Bonarius social profiles
Digital presenceBonarius compliance and trust
Trust signalCompliance14 records
Bonarius financial estimates
Financial estimateRevenue estimate
Valuation estimate
Bonarius leadership team
Management profileNumber of profiles
Profiles4 records
Bonarius subsidiaries and ownership
Company hierarchySubsidiaries2 records
Bonarius funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Bonarius 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 Bonarius
What does Bonarius do?
Bonarius maintains, installs, and remotely monitors central heating (CV) systems, hot water appliances, hybrid heat pumps, and heat recovery ventilation (WTW) installations, primarily under long-term service and TCO contracts with Dutch housing corporations and institutional clients. Through its proprietary BOA remote monitoring system and Zwerm large-scale maintenance methodology, the company manages over 270,000 individual CV installations and serves both B2B portfolio clients (housing corporations, healthcare, education, VVE's, property managers) and a limited base of private individuals.
Is Bonarius a public or private company?
Bonarius is a private company. It is classified as private equity controlled and is currently operating.
When was Bonarius founded?
Bonarius was founded in 1955. It employs 251 to 500 people.
Where is Bonarius based?
Bonarius is headquartered in Zwanenburg, Netherlands, in the Europe region.
How does Bonarius make money?
Three revenue lines are on record. Service & Onderhoud is the primary driver. The others are montage & Installatie and TCO-contracten.
Who are Bonarius's main competitors?
A.Hak Installatietechniek is listed as a regional player. Direct peers are HOMIJ, Breman Installatiegroep, Feenstra, Van Dorp Installateurs and Comfort Partners. Sureserve Group is listed as an others. Broad incumbents are ENGIE Nederland, Unica and Croonwolter&dros.
Does Bonarius have an API?
No public API is recorded for Bonarius.