Sunamp makes thermal batteries using its Plentigrade phase-change materials. Its UK site describes products that can store heat from grid electricity, solar and heat pumps, then supply hot water or other thermal loads.
The short answer
Sunamp is one of the most visible names in compact domestic heat storage, but the brand name is not a system specification. Choose a model only after matching its charge source, usable capacity, flow performance and installation requirements to the home.
What happens inside
Sunamp says its phase-change material absorbs heat while melting and releases it while solidifying. A heat exchanger transfers that energy into water. This is latent-heat storage, distinct from keeping a large volume of water hot.
What we have not published yet
We have not populated model dimensions, capacities or cylinder-equivalence figures. Those values will appear only after the current UK product page and technical sheet have been recorded with a checked date and test context.
Evidence to request with a quote
- exact model and revision
- usable stored energy and the stated test conditions
- continuous and peak hot-water flow at the required temperature rise
- standing heat loss
- charging power and maximum charge time
- dimensions, filled weight and required service clearance
- approved heat sources, controls and electrical supply
- warranty length, exclusions and installer requirements
Scottish engineering, national installation
Sunamp states that it designs and manufactures its thermal batteries at its headquarters near Edinburgh. Local manufacturing does not remove the need to check installer coverage and post-installation support for your postcode.
Your next step
Ask for the product data sheet and installation manual before paying a deposit. Put every quoted performance figure beside the page and test condition that supports it.
Sources
Primary and independent references checked by our editorial team.
- How thermal batteries work — Sunamp Checked 10 Nov 2026
- About Sunamp — Sunamp Checked 10 Nov 2026