OH4 LIMITED

What OH4 LIMITED does

OH4 LIMITED is a UK-based private company founded in 2019 that develops and installs the OH4 Heat Transfer System, a proprietary hardware retrofit designed to improve the efficiency of existing closed-loop water-based heating and cooling systems. The technology works by reprogramming the way water moves through a building's heating and cooling infrastructure to optimise thermal transfer, with claimed energy reductions of approximately 16–20% across reported customer installations. Installation is non-invasive, requires access only to plant rooms, and is positioned as requiring no replacement of boilers or chillers and causing no operational downtime.

The company operates a direct enterprise field-sales motion targeting large organisations in the UK hospitality, care home, and education sectors. Revenue is derived from the upfront installation of the heat transfer system combined with an ongoing service layer that includes ESG readiness assessment, scopes 1 and 2 carbon accounting support, and tailored financial and carbon reduction reporting delivered through OH4's in-house data team. Recommendations to prospective clients are based on a projected 20% saving on the previous year's energy costs, supported by case studies documenting measurable savings at named hotels including The Headland Hotel and One Hotel Mayfair.

OH4 is a micro-cap operation with 1–10 employees, based in Totnes/Torquay in Devon, UK, with no disclosed institutional funding, no M&A activity, and a partnership network comprising ESG Pro and several regional hospitality trade associations. The company does not publish pricing, operates exclusively in the UK market, and has not disclosed revenue figures or unit economics.

Name

OH4 LIMITED

Legal name

OH4 LIMITED

Website

https://oh4energysaving.com

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

OH4 LIMITED, founded in 2019 in the UK, installs a proprietary heat-transfer retrofit that improves efficiency of existing closed-loop heating and cooling systems, targeting enterprise hospitality, care home, and education clients with bundled ESG and carbon reporting services.

Ownership category

akta.pro rank

Product category

Building Energy Efficiency Services

NAICS

Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (333415), Power Boiler and Heat Exchanger Manufacturing (33241), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

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

akta.pro primary industry

Heat Exchangers & Thermal Transfer Equipment (IMAHAKAC)

Keywords

• Energy efficiency retrofits
• Heating system optimization
• Cooling system efficiency
• ESG carbon reporting
• Building energy savings

Headquarters

HQ city

Totnes

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Energy efficiency hardware and data reporting: OH4 installs its heat transfer system on client heating/cooling infrastructure and provides ongoing ESG readiness assessment, scopes 1 & 2 support, and tailored financial and carbon reduction reporting. Revenue is derived from the installation of the system combined with ongoing data management and reporting services. Recommendations are based on a projected 20% saving on clients' previous year's energy costs.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

OH4 LIMITED (trading as OH4 Energy Saving) develops and installs a proprietary magnetic frequency-based heat transfer retrofit that reprograms water flow in closed-loop heating and cooling systems to lower energy consumption. The company supplements the hardware installation with ESG readiness assessments, support for Scopes 1 and 2 reporting, and ongoing financial and carbon-reduction data management for its clients.

Product overview

OH4 LIMITED offers a unified energy-saving solution centered on the OH4 Energy Saving Solution (also called the OH4 Heat Transfer System), which is a hardware-based technology that optimizes water flow through existing closed-loop heating and cooling systems. The core product works by reprogramming how water moves through building heating/cooling infrastructure to increase thermal transfer efficiency. OH4 provides the system alongside two complementary services: an ESG Readiness Assessment and Support package that helps clients with carbon reporting requirements and scopes 1 & 2 accounting, and an ongoing Energy Data Management and Reporting service that tracks savings and produces tailored financial and environmental reports. The company targets hospitality, care homes, and education sectors with a non-invasive installation approach that requires no downtime or system replacements.

Differentiator

Problem solved

Functional benefit

Products and services

• OH4 Energy Saving Solution A turnkey energy-efficiency retrofit service that installs a magnetic frequency-based heat transfer system on existing closed-loop heating and cooling plant, designed for UK commercial buildings such as hotels, care homes, and education facilities.
• OH4 Heat Transfer System The proprietary hardware unit installed on site as part of the OH4 Energy Saving Solution; it uses magnetic frequency treatment to reprogram water flow behaviour within closed-loop heating and cooling circuits to improve efficiency.
• ESG Readiness and Carbon Reporting Service A data-management and advisory service that supports clients with ESG readiness assessments, Scopes 1 and 2 carbon reporting, and ongoing tracking of financial and carbon savings following installation.

Quantifiable outcome

• 20%+ energy savings (kWh per degree per day per guest)
• +2 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Five partnerships are on record, tiered minor.

• ESG ProminorGTM or Marketing PartnerListed as a partner on the OH4 website under 'Our partners'. ESG Pro appears to be a sustainability/ESG consultancy or platform that OH4 collaborates with to deliver ESG readiness assessments and reporting to clients.
• Cornwall Hospitality CollectiveminorGTM or Marketing PartnerListed as a partner on the OH4 website. Cornwall Hospitality Collective is a trade body for hospitality businesses in Cornwall, likely providing referral and networking opportunities for OH4.
• BHHPA (British Holiday & Home Parks Association)minorGTM or Marketing PartnerListed as a partner on the OH4 website. BHHPA is a trade association for the holiday and caravan park sector, potentially providing access to a network of hospitality operators.
• Visit South DevonminorGTM or Marketing PartnerListed as a partner on the OH4 website. Visit South Devon is a tourism organisation, potentially referring hospitality businesses in the South Devon region.
• Devon Chamber of CommerceminorGTM or Marketing PartnerListed as a partner on the OH4 website. Devon Chamber of Commerce provides networking and business support services in the Devon region, potentially supporting local business referrals.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Emerging players

• Cylon Controls: Cylon Controls (now part of Watts) provides building automation and HVAC control solutions targeting efficiency improvements. Comparable to OH4 because both deliver HVAC-side efficiency products aimed at reducing energy costs in commercial facilities.
• Caleffi S.p.A. Caleffi manufactures hydronic components for HVAC balancing and efficiency. Comparable to OH4 because both work in the water-side energy efficiency space, optimizing heat transfer and system performance in existing heating/cooling installations.

Broad incumbents

• Schneider Electric EcoStruxure: Schneider Electric provides building energy management and HVAC optimization solutions for commercial facilities including hospitality. Comparable to OH4 because both address efficiency and ESG reporting needs in commercial buildings, though Schneider offers a broader portfolio.
• Honeywell Building Technologies: Honeywell provides comprehensive building management and energy optimization solutions including HVAC controls and efficiency services. Comparable to OH4 because both sell enterprise-grade energy efficiency and ESG-related building solutions, though Honeywell is a broad incumbent vs. OH4's niche retrofit focus.
• Johnson Controls OpenBlue: Johnson Controls offers building HVAC, controls, and energy efficiency services including retrofit and decarbonization solutions. Comparable to OH4 because both target HVAC energy savings in commercial buildings with ESG/carbon reporting overlays.

Direct peers

• Belimo Holding AG: Belimo manufactures HVAC actuators, control valves, and sensor solutions for hydronic heating and cooling systems. Comparable to OH4 because both operate in the water-side HVAC optimization niche, improving heat transfer and system efficiency through component-level interventions on existing plant.
• IMI Hydronic Engineering: IMI Hydronic Engineering provides hydronic balancing and flow optimization solutions for HVAC systems. Comparable to OH4 because both target efficiency gains in closed-loop water-based heating/cooling systems through flow optimization technology and work on existing infrastructure.
• Trend Control Systems: Trend Controls (a Honeywell company) provides building energy management systems with HVAC optimization. Comparable to OH4 because both focus on optimizing heating/cooling system efficiency through controls and data monitoring in commercial buildings.
• Sauter AG: Sauter AG manufactures building management systems and HVAC controls that optimize heating and cooling efficiency in commercial buildings. Comparable to OH4 because both deliver water-side optimization and control solutions that improve HVAC efficiency in existing buildings without full system replacement.

Regional players

• Kensa Heat Pumps: Kensa is a UK-based manufacturer of ground-source heat pumps for heating decarbonization. Comparable to OH4 because both are UK-headquartered cleantech vendors targeting commercial/hospitality customers seeking to reduce heating-related carbon emissions.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

• LinkedInlinkedin.com/company/oh4-limited

Revenue estimate

Valuation estimate

Number of profiles

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 OH4 LIMITED