Domestic hot water and space heating with Plentigrade PCMs

Deliver compact, efficient hot water and low-temperature heating using mid-high temperature PCMs tuned for real-world systems.

Operating temperatures & duty

Typical plateaux: 43°C, 50°C, 58°C

Charge sources: heat pumps, boilers, resistive elements, solar

PV Duty: daily cycling on DHW draw and comfort set points; off-peak charge and on demand discharge

Where it helps

  • Takes up less space and loses less heat than traditional hot water cylinders, thanks to high energy density PCM storage.
  • Shifts energy use by charging off-peak and delivering hot water when it’s needed most.
  • Supports heat pumps with steady thermal output, even as demand changes.
  • Makes better use of solar PV by storing excess daytime energy for later hot water use.

Target temperatures Best-fit PCM Typical charge sources
~43 °C P43 (salt hydrate)
  • Heat pump
  • Condensing boiler 50–60 °C
50 °C P50 (salt hydrate)
  • Heat pump 50–55 °C
  • Boiler 60–70 °C with mixing
  • Electric element
  • Solar PV diversion
58 °C P58 (salt hydrate; variants P58o, P58e, no-nucleator)
  • Boilers & electric elements
  • High temp heat pumps
  • Solar PV diversion

How do I pick the right plateau?

Select a PCM with a tight melting/freezing temperature range that matches your critical process tolerance, and always include a safety margin of at least 10-20% extra mass to account for real-world inefficiencies and potential peak loads. We can provide a quick PCM vs glycol system comparison.

Any safety or handling concerns?

Salt hydrates & clathrates are non-flammable. Organics are combustible and clearly labelled.