Sunamp

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.

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

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

• Thermal energy storage
• Phase change material
• Heat battery systems
• Domestic hot water storage
• Building decarbonisation solutions

Headquarters

HQ city

Macmerry

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. 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

Go-to-market motion3 records

Distribution channels5 records

Marketing channels8 records

Core 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

Named customers14 records

Segments7 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Eco Edge SolutionscoreChannel Partner/ Reseller/ Distributor · 28 October 2025U.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.
• UrelcoreStrategic or Co-development PartnerPartnership agreement to bring industrial heat decarbonisation solutions to Turkey. Combines Sunamp's thermal storage technology with Urel's industrial expertise.
• Kensa ContractingcoreImplementation/ SI/ Consulting PartnerPartnership 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.
• ENGIEcoreImplementation/ SI/ Consulting PartnerEnergy 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 EdinburghcoreStrategic or Co-development PartnerAcademic 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 StartupsminorStrategic or Co-development PartnerCollaboration 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

Emerging 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

• LinkedInlinkedin.com/company/sunamp-limited

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries2 records

Funding overview

Funding rounds12 records

Investors9 records

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 Sunamp