Yes we have 2no Sunamp duties that together make up our hot water storage. They work great and are very space saving relative to a water cylinder.
Yes when using a heat pump to heat up / phase change the Sunamp unit you will have a somewhat more restricted choice of models to choose from, although the more recent models tend to be able to operate up to ~60C with little problem. There may also (probably) be slight reduction in COP from your heat pump relative to cylinder HW storage, especially if you run your cylinder below 50C a lot of the time.
Also worth noting that Sunamp units have very low heat loss so they will store heat for a long time.Sunamp and other storage devices - #3 by zapaman
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