Thermal stores allow multiple heat sources to be connected in a number of different ways, with immersion heater(s) back-up. This makes it possible to have a gas or oil fired boiler connected to a solid fuel appliance and also a renewable heat source such as solar thermal or a heat pump. Furthermore, underfloor heating system manifolds as well as radiator circuits can also be directly connected to the store.
  • 25 year material guarantee on cylinder/store shell (Subject to Terms & Conditions)
  • 22mm and 28mm compression fittings
  • No anode required
  • Immersion heater
  • Labelled and colour-coded tappings
  • Global warming potential (GWP) = less than 3
  • Ozone depletion potential (ODP) = 0

Technical specification

Width555 mmTypeThermal StoreHeight1735 mmEnergy Efficiency RatingCCapacity300 LRange DescriptionCylindersManufacturer Model NoGTHERM300HWUBrand NameGrant


Grant Thermawave Sealed System Stainless Steel 300 Litre Thermal Store C/W Hot Water Coil



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