Rinnai UK
Rinnai UK is the British subsidiary of Japanese gas-appliance manufacturer Rinnai Corporation, supplying commercial and domestic continuous flow water heaters, hydrogen blend-ready units, low-GWP heat pumps, and hybrid heating systems to healthcare, hospitality, retail, military, and food/beverage customers via direct enterprise sales and certified installer partners.
- Company typePrivate
- Founded-
- HeadquartersRuncorn, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Rinnai UK does
Rinnai UK Limited is the UK subsidiary of Rinnai Corporation, a Japanese-headquartered global manufacturer of gas appliances. The company develops and distributes commercial and domestic water heating systems, specialising in continuous flow (instantaneous) condensing water heaters — including the Sensei N Series (the first UK unit manufactured with stainless steel heat exchangers) and the HDC heavy-duty range — alongside a comprehensive portfolio of hydrogen blend-ready products (I2HY20 certified for 20% H2), low-GWP air source heat pumps using R290, R32, and R454B refrigerants (6kW to 410kW), and hybrid systems integrating solar thermal or heat pump technology with gas boosters. The business is structured around the H1/H2/H3 sustainability concept, providing pathways to NetZero across gas, hybrid, and electric-heat-pump solutions.
The company's technology stack is anchored by proprietary burner modulation with a market-leading 13:1 turn down ratio (58kW down to 2.4kW), 96–107% net thermal efficiency on condensing models, Nexus electrolytic scale protection, and the MECS (Manifold Electronic Control System) for intelligent cascade sequencing. Extended commercial warranties of up to 12 years and comprehensive design support — including BIM/CAD drawings, carbon and lifecycle modelling, CapEx/OpEx analysis — accompany product sales.
Commercially, Rinnai UK operates enterprise field sales supported by a network of certified installation partners (Arcus FM, Kimpton, CBFM, Kestrel Mechanical Services, H Pickup, A P Mitchell, Comgas Heating) plus an exclusive Malta distributor (Energy Saving Solutions) serving customers across healthcare (NHS hospitals, care homes), hospitality (hotels, castles, spas), retail (~300 UK supermarket stores), food and beverage production, military (MoD), and events. Pricing is quote-based with revenue generated from hardware sales and ancillary technical design services. The entity is privately held by Rinnai Corporation and registered in England (company number 1247352), with its headquarters in Runcorn, Cheshire.
Rinnai UK firmographics
Firmographics- Name
- Rinnai UK
- Legal name
- Rinnai UK Limited
- Website
- https://rinnai-uk.co.uk
- Company type
- Private
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Rinnai UK is the British subsidiary of Japanese gas-appliance manufacturer Rinnai Corporation, supplying commercial and domestic continuous flow water heaters, hydrogen blend-ready units, low-GWP heat pumps, and hybrid heating systems to healthcare, hospitality, retail, military, and food/beverage customers via direct enterprise sales and certified installer partners.
- Ownership category
- akta.pro rank
Rinnai UK industry classification
Industry- Product category
- Commercial Water Heating Equipment
- NAICS
- Power Boiler and Heat Exchanger Manufacturing (332410), Power Boiler and Heat Exchanger Manufacturing (33241), Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413), Pump and Compressor Manufacturing (33391)
- SIC
- Heating Equip, Except Elec & Warm Air; & Plumbing Fixtures (3430), Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)
- akta.pro primary industry
- Heat Exchangers & Thermal Transfer Equipment (IMAHAKAC)
- akta.pro secondary industries
- Heat Pumps (Air/Water/Ground Source) (IMAHAKAF), Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC)
Keywords
Where Rinnai UK is headquartered
LocationHeadquarters
- HQ city
- Runcorn
- HQ country
- United Kingdom
- HQ region
- Europe
Offices2 records
Markets served
Rinnai UK business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Marketing or Sales, Operations, Technology or R&D
Revenue model
- Water Heating Equipment Sales: Sale of continuous flow gas water heaters, commercial heat pumps, hybrid systems, and associated equipment. Products include N Series commercial water heaters (N1600i, N1600e, N1300i, N1300e), HDC series units, Infinity domestic water heaters, and heat pump systems ranging from 6kW to 410kW.
- Technical Design Services: Technical services including system design support, capital expenditure and operational expenditure calculations, carbon footprint analysis, BIM & CAD drawings, and commissioning support provided to customers and contractors.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | Commercial continuous flow water heaters with extended warranty options |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels5 records
Rinnai UK product offering
Product offeringCore offering
Rinnai UK manufactures, distributes and supports commercial and domestic continuous flow (tankless) gas-fired water heaters, condensing heavy-duty water heaters, low-GWP air source heat pumps and hybrid hot water/heating systems. Offerings span the N Series, HDC Series, Infinity KCM and E Series units, hydrogen-blend-ready (I2HY20) models, and R290/R32/R454B heat pumps from 6kW to 410kW, complemented by system design, BIM/CAD, carbon modelling and commissioning technical services.
Product overview
Rinnai UK is a global leader in heating and hot water appliance manufacturing offering a comprehensive portfolio of commercial and domestic water heating solutions. The product portfolio centers on continuous flow condensing water heaters (N Series, HDC Series, Infinity KCM Series) with hydrogen blend readiness, commercial air source heat pumps using low-GWP refrigerants (R290, R32, R454B) ranging from 6kW to 410kW, and hybrid systems combining solar thermal or heat pump technology with gas boosters. Key product categories include: commercial condensing water heaters (N1600/N1300, HDC1500/1200), domestic gas water heaters (Infinity KCM, E Series), hydrogen blend ready units (20% H2 ready), commercial heat pumps (R290, R32, R454B from 4kW to 410kW), hybrid hot water/heating systems, electric storage solutions, and IoT/control accessories. The portfolio is organized around three sustainability pathways: H1 (hydrogen/bio-LPG ready), H2 (hybrid solutions), and H3 (heat pumps).
Differentiator
Problem solved
Functional benefit
Brands
- Rinnai Infinity: Range of continuous flow gas fired water heaters for domestic and commercial use
- N Series
- Sensei N Series
- H Series (H1, H2, H3)
Products and services
- N Series Commercial Condensing Water Heaters First continuous flow water heater in the UK with stainless steel heat exchangers; four models (N1600i, N1600e, N1300i, N1300e) delivering 775-954 litres per hour at 50°C rise, 13:1 turn down ratio, up to 97% efficiency, for commercial applications such as hospitals, hotels and supermarkets.
- HDC Series Heavy-Duty Condensing Water Heaters High-capacity condensing continuous flow units (HDC1500i, HDC1200i) with up to 107% net efficiency, modulation from 54kW down to 2.4kW, and delivery exceeding 1500-2000 litres per hour for large-scale commercial and industrial sites.
- Infinity KCM Series Continuous Flow Water Heaters Domestic tankless multipoint gas water heaters providing continuous flow hot water delivery for residential applications.
- E Series External Condensing Water Heaters External wall-mounted condensing water heaters designed for outdoor installation, suitable for mobile and temporary hot water applications.
- Hydrogen Blends Ready 20% Continuous Flow Water Heaters (Infinity 11i / 17i) I2HY20-certified units capable of operating with up to 20% hydrogen blend in natural gas, including the Infinity 11i (24kW) and 17i (35kW) models for future-proofed decarbonisation.
- Low GWP R290 Air Source Heat Pump 6kW - 18kW Commercial air source heat pump using R290 (propane) refrigerant with low Global Warming Potential, for smaller commercial installations.
- Low GWP R290 Air Source Heat Pump 21kW - 27kW Medium-capacity commercial heat pump with R290 refrigerant for moderate commercial heating and hot water demands.
- Low GWP R290 Air Source Heat Pump 40kW - 50kW Larger commercial heat pump using low-GWP R290 refrigerant for substantial commercial heating requirements.
- HPI R32 Air Source Heat Pump 4kW - 18kW Entry-level commercial air source heat pump using R32 refrigerant with inverter technology for smaller commercial applications.
- HPIH R32 Inverter Monobloc Heat Pump 21kW - 32kW Mid-range inverter monobloc heat pump with R32 refrigerant for medium commercial installations.
- HPHP Inverter Air Source Heat Pump 48kW - 70kW High-capacity inverter heat pump for large commercial heating applications.
- HPMAX 66kW - 115kW Air Source Heat Pump Maximum capacity commercial air source heat pump for large-scale heating and hot water systems.
- R290 Commercial and Industrial Heat Pumps 40kW - 410kW Industrial-scale heat pumps using low-GWP R290 refrigerant for large commercial and light industrial applications.
- R454B Commercial and Industrial Heat Pumps Commercial heat pumps using R454B refrigerant for industrial-scale heating applications.
- Hybrid Hot Water Solutions - Solar Thermal Systems combining solar thermal collectors with Rinnai condensing water heaters as boosters, maximising solar gains while ensuring temperature requirements are met.
- Hybrid Heating Systems
Quantifiable outcome
- 73% reduction in daily fuel consumption (from ~750 kWh/day to ~200 kWh/day)
- +5 more outcomes
Companies that use Rinnai UK
Customer profileNamed customers13 records
Segments6 records
Ideal customer profiles7 records
Rinnai UK technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Rinnai UK partnerships and signals
Strategic signalPartnerships
Ten partnerships are on record, tiered core and minor.
- Kimpton (HVAC Specialist Contractor)coreLiverpool and Northwest-based HVAC specialist contractor. Kimpton supplied and installed emergency replacement Rinnai hot water heating system at Spire Murrayfield Hospital. The partnership demonstrates expertise in rapid deployment and hydrogen-ready technology installation with support from Rinnai technical teams.
- KimptoncoreKimpton has been delivering M&E projects and HVAC services since 1963 with culture of innovation including UK's first water source heat pumps in open sea and first Transpired Solar Collectors with TATA Steel.
- CBFMminorCBFM installed two N Series continuous flow water heaters at Sycamore Care Home in Huddersfield, including 300L cylinder store with first-hour flow rate of 2407L.
- A P Mitchell Building ServicesminorA P Mitchell Building Services installed Rinnai systems at various NHS walk-in centres, care homes including Clifton Park Hospital York, and Peckforton Castle hybrid installation.
- H Pickup Mechanical & Electrical ServicesminorEstablished over 100 years ago, H Pickup installed Rinnai HDC1200i units at North East seafood processing plant. Company employs own staff engineers for design, installation and ongoing support.
- Arcus FMcoreOne of UK's leading FM companies with 1000+ multi-skilled engineers. Arcus completed installation of 2 x Rinnai 1600 models at major supermarket chain, supporting customers with annual sales exceeding £35 billion.
- Comgas HeatingminorAdvisory and installation contractor for Rinnai continuous flow water heaters at Combe Hay Care Home in Scarborough.
- Kestrel Mechanical ServicesminorSevenoaks, Kent-based mechanical services company that installed two Rinnai HDC1500i units at care home in South East England with emphasis on service excellence and energy efficiency.
- Energy Saving and Conservation Solutions (Malta)coreSole supplier of Rinnai products on Malta since 2007, founded by Franco Bileci. Company provides complete installation and services on thousands of domestic and commercial sites including hotels, medical facilities, and retirement homes.
- Global Food Service Chain Electrical ContractorscoreElectrical contracting concern working with Rinnai to implement H1/H2/H3 concept across the chain's UK outlets as part of carbon reduction programme.
Scale indicators5 records
Recent moves6 records
Expansion highlights6 records
Rinnai UK competitors and assessment
Company assessmentDirect peers
- Daikin UK: Daikin is a global HVAC leader with a strong UK commercial heat pump portfolio, directly overlapping Rinnai's R290 and R32 commercial heat pump offerings. Comparable in serving healthcare, hospitality and commercial decarbonisation projects, though Daikin leads on air conditioning and VRF while Rinnai leads on water heating.
- Viessmann (UK): Viessmann is a German commercial heating manufacturer with a UK commercial water heating and heat pump presence. Directly comparable in commercial condensing water heaters, hybrid systems, and now hydrogen-ready product positioning similar to Rinnai's I2HY20 line.
- Vaillant (UK): Vaillant is a direct competitor in the UK commercial and domestic heating market, offering commercial boilers, water heaters, and increasingly heat pumps and hybrid systems. Highly comparable as both companies compete head-to-head in healthcare, hospitality, and new-build commercial specifications across the UK.
- Bosch Thermotechnology (Worcester Bosch): Worcester Bosch is the dominant UK domestic and light commercial boiler brand, with growing commercial water heating and heat pump ranges. Directly comparable product portfolio (gas condensing water heaters, hybrid systems, commercial heating) and overlapping installer network.
- Ideal Heating (Commercial): Ideal Heating is a major UK commercial boiler and water heating manufacturer (part of Groupe Atlantic). Directly competes with Rinnai in commercial continuous flow water heaters and condensing boilers for healthcare, education, and large residential specifications.
- Hamworthy Heating (Trane Technologies): Hamworthy Heating is a UK commercial water heating specialist (owned by Trane Technologies), competing directly with Rinnai in large commercial continuous flow and calorifier replacement projects across healthcare, leisure, and hospitality.
- Mitsubishi Electric (UK): Mitsubishi Electric is a major UK heat pump and HVAC competitor, particularly in the Ecodan commercial air source heat pump range that competes with Rinnai's R290/R32 portfolio. Comparable in serving decarbonisation-driven commercial specifications in healthcare and education sectors.
- Baxi Commercial (BDR Thermea Group): Baxi Commercial (part of BDR Thermea) sells commercial boilers, water heaters, and heat pumps in the UK, directly competing with Rinnai in healthcare, hospitality, and public-sector specifications. Comparable product portfolio focused on commercial water heating decarbonisation.
- Lochinvar (UK): Lochinvar is a US-headquartered commercial water heater specialist with UK distribution, directly competing with Rinnai's N Series and HDC continuous flow water heaters in healthcare, hospitality, and commercial building specifications.
Emerging players
- Panasonic Heating & Cooling (UK): Panasonic is an emerging commercial heat pump competitor in the UK with its Aquarea range, overlapping Rinnai's heat pump portfolio in commercial decarbonisation projects. Less established in commercial water heating than Rinnai but increasingly competitive on heat pumps.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights7 records
Customer concentration
Rinnai UK social profiles
Digital presenceRinnai UK financial estimates
Financial estimateRevenue estimate
Valuation estimate
Rinnai UK leadership team
Management profileNumber of profiles
Profiles6 records
Rinnai UK funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Rinnai UK 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 Rinnai UK
What does Rinnai UK do?
Rinnai UK manufactures, distributes and supports commercial and domestic continuous flow (tankless) gas-fired water heaters, condensing heavy-duty water heaters, low-GWP air source heat pumps and hybrid hot water/heating systems. Offerings span the N Series, HDC Series, Infinity KCM and E Series units, hydrogen-blend-ready (I2HY20) models, and R290/R32/R454B heat pumps from 6kW to 410kW, complemented by system design, BIM/CAD, carbon modelling and commissioning technical services.
Is Rinnai UK a public or private company?
Rinnai UK is a private company. It is classified as corporate owned and is currently operating.
When was Rinnai UK founded?
Rinnai UK was founded in -1. It employs 11 to 50 people.
Where is Rinnai UK based?
Rinnai UK is headquartered in Runcorn, United Kingdom, in the Europe region.
How does Rinnai UK make money?
Two revenue lines are on record. Water Heating Equipment Sales are the primary driver. The others are technical Design Services.
Who are Rinnai UK's main competitors?
Direct peers on record are Daikin UK, Viessmann (UK), Vaillant (UK), Bosch Thermotechnology (Worcester Bosch), Ideal Heating (Commercial), Hamworthy Heating (Trane Technologies), Mitsubishi Electric (UK), Baxi Commercial (BDR Thermea Group) and Lochinvar (UK). Panasonic Heating & Cooling (UK) is listed as an emerging player.
Does Rinnai UK have an API?
No public API is recorded for Rinnai UK.
What industry is Rinnai UK in?
Rinnai UK's product category is Commercial Water Heating Equipment. Its primary akta.pro industry code is IMAHAKAC, Heat Exchangers & Thermal Transfer Equipment, with a secondary code of IMAHAKAF, Heat Pumps (Air/Water/Ground Source). Its NAICS code is 332410 and its SIC code is 3430.