Sunamp
Sunamp designs and manufactures compact phase change material (PCM) heat batteries for residential, social housing, commercial, and industrial customers. It sells via certified installers and channel partners across the UK, Europe, North America, and selected international markets.
- Company typePrivate
- Founded2005
- HeadquartersMacmerry, United Kingdom
- Headcount51–100
- GTM typeB2B
- OfferingHardware or Manufacturing
What Sunamp does
Sunamp Ltd. is a UK-based thermal energy storage company founded in 2005 and headquartered in Macmerry, East Lothian, with additional regional offices in New York and Zurich and wholly owned subsidiaries in Canada (Sunamp Projects Inc.) and Switzerland (Sunamp Switzerland GmbH). The company designs, manufactures, and sells compact phase change material (PCM) heat batteries under its patented Plentigrade platform, developed in partnership with the University of Edinburgh. Its product range spans the Thermino line for domestic hot water (Thermino, Thermino ePlus, Thermino xPlus, Thermino TS), the Central Bank system for building-scale heating, and Permafrost for cooling applications, supported by the Optimino integration layer for heat pump and solar PV compatibility. Sunamp's heat batteries are positioned as 10x more energy-dense and 65–90% smaller than conventional hot water cylinders, with ultra-low standby losses and no mandatory annual maintenance, and are certified to CE, UKCA, Kiwa, NSF, UL, and ISO 9001/14001/45001 standards, with RAL A-Grade certification for the Plentigrade P58 PCM formulation.
Sunamp firmographics
Firmographics- Name
- Sunamp
- Legal name
- Sunamp Ltd
- Website
- https://sunamp.com
- Company type
- Private
- Founded year
- 2005
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- Sunamp designs and manufactures compact phase change material (PCM) heat batteries for residential, social housing, commercial, and industrial customers. It sells via certified installers and channel partners across the UK, Europe, North America, and selected international markets.
- Ownership category
- akta.pro rank
Sunamp industry classification
Industry- Product category
- Thermal Energy Storage
- NAICS
- Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (333415), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334), Power Boiler and Heat Exchanger Manufacturing (332410)
- SIC
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)
- akta.pro primary industry
- Phase-Change Material (PCM) Thermal Storage (Encapsulated, Building-Integrated) (EUAFANAD)
- akta.pro secondary industries
- Hot Water & Stratified Tank Storage (District Energy & Buildings) (EUAFANAC), Thermal LDES (High-Temperature, Molten Salt, Carnot/Heat-to-Power) (EUAFADAC), District Heating & Cooling Thermal Storage (Network-Integrated TES) (EUAFANAH), Heat Exchangers & Thermal Transfer Equipment (IMAHAKAC)
Keywords
Where Sunamp is headquartered
LocationHeadquarters
- HQ city
- Macmerry
- HQ country
- United Kingdom
- HQ region
- Europe
Offices3 records
Markets served
Sunamp business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Technology or R&D, Operations, Marketing or Sales, Infrastructure
Revenue model
- Thermal Battery Product Sales: Sunamp designs, manufactures, and sells thermal battery products (Thermino range, Central Bank, Permafrost) through a network of approved distributors, stockists, and certified installers. Products are sold as hardware with installation, targeting residential, commercial, and industrial customers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | Thermino range - various sizes and configurations |
Go-to-market motion3 records
Distribution channels5 records
Marketing channels8 records
Sunamp product offering
Product offeringCore offering
Sunamp designs and manufactures compact thermal energy storage products (heat batteries) using its patented Plentigrade phase change material (PCM) technology. Its Thermino range, Central Bank, and Permafrost products deliver domestic hot water, space heating, and cooling storage for residential, commercial, and industrial customers, replacing traditional hot water cylinders with up to 10x more energy dense, 65-90% smaller, and ultra-low heat loss solutions.
Differentiator
Problem solved
Functional benefit
Brands
- Thermino: Heat battery product line for domestic hot water using phase change material technology.
- Plentigrade
- Central Bank
- Permafrost
Products and services
- Thermino Heat Battery Range Compact Plentigrade PCM-based thermal batteries for domestic hot water storage, designed as a space-saving replacement for conventional hot water cylinders in residential settings. Available in multiple sizes/configurations for varied household demands.
- Thermino ePlus Variant of the Thermino heat battery designed for enhanced efficiency residential hot water storage applications using Plentigrade PCM technology.
- Thermino xPlus Higher-temperature Thermino heat battery variant engineered for heat pump integration, compatible with Daikin, Samsung, and Vaillant systems for residential and small commercial hot water storage.
- Thermino TS Thermal store variant of the Thermino heat battery range, configured for thermal store hot water applications.
- Central Bank for Heating Larger-scale thermal energy storage product using Plentigrade PCM for commercial and industrial building heating applications.
- Central Bank Mini Compact variant of the Central Bank thermal storage product designed for commercial and industrial heating applications.
- Permafrost for Cooling PCM-based cooling thermal storage product for building cooling and refrigeration applications in commercial and industrial settings.
- Permafrost Mini Compact variant of the Permafrost cooling thermal storage product for commercial and industrial cooling applications.
- Custom Design Heat Batteries Bespoke engineering service providing custom-designed thermal battery solutions tailored to specific commercial, industrial, or specialised deployment requirements beyond the standard product line.
- Industrial Thermal Energy Storage System Thermal energy storage system launched in March 2026 for industrial use, positioned within non-lithium energy storage advances.
Quantifiable outcome
- Up to 10x more energy dense and 65-90% less space than conventional hot water systems
- +7 more outcomes
Companies that use Sunamp
Customer profileNamed customers14 records
Segments7 records
Ideal customer profiles3 records
Sunamp technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Sunamp partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered core and minor.
- Eco Edge SolutionscoreU.S. distribution agreement for Sunamp's Thermino thermal storage systems, targeting New York City buildings to meet Local Law 97 emissions standards. Eco Edge Solutions distributes Thermino products in the U.S. market.
- UrelcorePartnership agreement to bring industrial heat decarbonisation solutions to Turkey. Combines Sunamp's thermal storage technology with Urel's industrial expertise.
- Kensa ContractingcorePartnership for Gentoo Group's Core 364 gas replacement programme. Kensa supplies Shoebox ground source heat pumps integrated with Sunamp heat batteries. 364 apartments in Sunderland.
- ENGIEcoreEnergy services supplier engaged by Gentoo Group for advice on gas boiler replacement. Facilitated the Core 364 programme combining Kensa heat pumps with Sunamp heat batteries.
- University of EdinburghcoreAcademic partnership for development of Plentigrade phase change material technology. Joint research led to creation of stable PCM showing no degradation over 50 years equivalent use.
- Other UK Energy StartupsminorCollaboration with other UK energy startups for the government-funded project, leveraging wind energy and combining technologies for renewable heating solutions.
Scale indicators11 records
Recent moves8 records
Expansion highlights6 records
Sunamp competitors and assessment
Company assessmentEmerging players
- Malta Inc. Malta develops pumped heat electricity storage and long-duration thermal storage for grid-scale applications. It competes with Sunamp in the longer-duration energy storage category, though Malta targets utility-scale grid storage rather than residential and building thermal storage.
- Antora Energy: Antora Energy builds thermal battery systems for industrial decarbonization using carbon blocks and thermophotovoltaic conversion. It overlaps with Sunamp's industrial thermal energy storage product (Central Bank) in the C&I decarbonization segment but at much larger scale.
- Stiesdal / EnergyStorage (GridScale thermal storage): Stiesdal's EnergyStorage and GridScale technologies use thermal storage (including hot water/heat storage) for utility-scale and industrial applications. They are an emerging European peer competing for the long-duration thermal storage market that Sunamp is beginning to address with its industrial product launches.
Broad incumbents
- Heatco / Gledhill (UK hot water cylinder manufacturers): Gledhill and similar UK hot water cylinder manufacturers (Heatco, Joule UK) sell the conventional unvented cylinders that Sunamp's Thermino directly displaces. They represent the incumbent baseline that Sunamp's heat batteries replace in social housing and residential retrofits.
- Daikin (heat pump manufacturer with thermal storage offerings): Daikin is a global HVAC and heat pump manufacturer whose heat pumps are explicitly compatible with Sunamp's Thermino xPlus, but who also offers its own thermal storage and hot water tank solutions. Represents both a partner and adjacent competitor in the heat pump + thermal storage system.
- Siemens Gamesa / Siemens Energy (thermal storage portfolio): Siemens Energy operates in industrial-scale thermal energy storage including molten salt and steam accumulator solutions for power and process heat. It is a broad incumbent whose thermal storage portfolio competes with Sunamp's emerging Central Bank industrial product line at larger utility and industrial scales.
Regional players
- Kensa Contracting: UK ground-source heat pump installer that integrates Sunamp heat batteries in social housing retrofits (Gentoo Core 364). It is a partner but also a comparable in the integrated heat pump + thermal storage retrofit market for UK housing associations.
Direct peers
- Calisen (Smarter Energy Homes / EV.Energy partnerships): UK smart meter and in-home energy solutions provider that has deployed residential thermal storage and heat battery solutions to housing associations, overlapping with Sunamp's social housing customer base and the Gentoo/EastHeat-style retrofit use cases.
- Octopus Energy (Cosy heat battery): Octopus Energy launched Cosy, a competing PCM-based heat battery for residential hot water and heat pump pairing in the UK. It is the most direct head-to-head competitor to Sunamp's Thermino range, targeting the same social housing and residential retrofit customer base with vertically integrated energy retail channels.
- Hotpod Heat Battery (by Tepeo): Tepeo's Hotpod is a UK-based zero-emission heat battery for domestic hot water, directly competing with Sunamp's Thermino. Both companies target social housing retrofits, heat pump integration, and off-peak tariff optimization in the UK residential market.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Sunamp social profiles
Digital presenceSunamp financial estimates
Financial estimateRevenue estimate
Valuation estimate
Sunamp leadership team
Management profileNumber of profiles
Profiles1 record
Sunamp subsidiaries and ownership
Company hierarchySubsidiaries2 records
Sunamp funding detail
Funding detailFunding overview
Funding rounds12 records
Investors9 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Sunamp 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 Sunamp
What does Sunamp do?
Sunamp designs and manufactures compact thermal energy storage products (heat batteries) using its patented Plentigrade phase change material (PCM) technology. Its Thermino range, Central Bank, and Permafrost products deliver domestic hot water, space heating, and cooling storage for residential, commercial, and industrial customers, replacing traditional hot water cylinders with up to 10x more energy dense, 65-90% smaller, and ultra-low heat loss solutions.
Is Sunamp a public or private company?
Sunamp is a private company. It is classified as venture growth investor backed and is currently operating.
When was Sunamp founded?
Sunamp was founded in 2005. It employs 51 to 100 people.
Where is Sunamp based?
Sunamp is headquartered in Macmerry, United Kingdom, in the Europe region.
How does Sunamp make money?
One revenue line is on record: thermal Battery Product Sales.
Who are Sunamp's main competitors?
Emerging players on record are Malta Inc., Antora Energy and Stiesdal / EnergyStorage (GridScale thermal storage). Broad incumbents are Heatco / Gledhill (UK hot water cylinder manufacturers), Daikin (heat pump manufacturer with thermal storage offerings) and Siemens Gamesa / Siemens Energy (thermal storage portfolio). Kensa Contracting is listed as a regional player. Direct peers are Calisen (Smarter Energy Homes / EV.Energy partnerships), Octopus Energy (Cosy heat battery) and Hotpod Heat Battery (by Tepeo).
Does Sunamp have an API?
No public API is recorded for Sunamp.
What industry is Sunamp in?
Sunamp's product category is Thermal Energy Storage. Its primary akta.pro industry code is EUAFANAD, Phase-Change Material (PCM) Thermal Storage (Encapsulated, Building-Integrated), with a secondary code of EUAFANAC, Hot Water & Stratified Tank Storage (District Energy & Buildings). Its NAICS code is 333415 and its SIC code is 3585.