Sunamp offers a dedicated custom design service for OEMs and resellers who want thermal storage that fits their portfolio, not the other way around. From compact heat batteries for appliances to larger-scale modules for heat pumps and district systems, we co-design solutions that deliver higher efficiency, lower carbon and a better experience for your customers.
Differentiate your brand with super-compact heat storage
Your customers expect quieter, smaller, smarter systems that just work. Standard tanks and cylinders can’t always meet those expectations. With Sunamp’s custom design service, you can integrate proven thermal battery technology directly into your product architecture – freeing up space, simplifying installation and improving performance across heating, hot water and cooling applications.
Key benefits:
- Differentiate your offer: Integrate advanced thermal storage to create tailor made thermal stores that stand out on efficiency, comfort and sustainability.
- Optimise form factor: Colour, size and connection layouts designed to your product envelope and installation requirements.
- Accelerate decarbonisation: Use trusted, IP protected,high performance Plentigrade phase change materials to support low carbon heat sources and cut emissions.
- Enhance user experience: Faster hot water delivery, stable temperatures, and compact, quiet systems your customers will notice.
How our custom design service works
We design with you, and work as an extension of your engineering and product teams, bringing deep expertise in thermal storage, phase change materials and system integration. Whether you’re introducing a new product line or upgrading an existing range, we help you move from idea to manufacturable design.
We can supply volumes of several thousand thermal batteries per year and, under a licensing agreement, provide full technical support to help you establish and operate your own heat battery manufacturing line.

Explore
Initial discussion to understand your product roadmap, challenges and opportunities for thermal storage.

Define
Joint requirements and success criteria, including performance, cost, footprint and timelines.

Design
Concept selection, detailed design, modelling and simulations with proprietary tools and integration with your mechanical and control systems.

Validate
Prototyping, lab testing and field trials, with data driven refinements. We also guide you through relevant standards and regulatory pathways.

Scale
Support for production up to multi-market rollout, supply and continuous improvement.
Customisation that creates competitive advantage and minimises development time and costv
You’re not starting from scratch. Our custom designs build on Sunamp’s proven thermal battery technology, perfected over decades and installed in thousands of systems worldwide. You get the reliability of an IP protected mature and modular platform that meets regulatory standards, with the flexibility of a custom solution.
Not only is Sunamp recognised as a world leader in thermal storage technologies, but we also have many prestigious innovation awards to prove it.
If you’re planning a new product or looking to upgrade an existing range, a short conversation with our OEM design team can reveal where custom storage will add the most value, and how we can get you from idea to prototype.