I have a mixing device Laddomat 21 installed for my boiler + accumulator tank. I have all pipes around the boiler insulated with pre-formed moulded mineral wool insulation, but there is no insulation on the Laddomat unit. As the unit is quite hot (70-90 deg.C) and its metalic area quite large, I assume the thermal loss on it can be substantial. For newer/large models the manufacturer is selling a ready to use insulation from EPP (see image), but there is none available for this type.
How could I make a DIY insulation for it? If possible, the insulation should be possible to take apart if some service is needed on the Laddomat.