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You could also use an insulated kettle for hot water. I just bought this Vektra one: https://vektra.uk/collections/series-1/products/vektra-1-5l-stainless-steel_11
Too early to say how well it copes with SE limescale, but it certainly does what it claims in terms of keeping water hot for a couple of hours.
chez_jay
We have to run our kitchen hot tap (and therefore boiler) for about 45 seconds before the water gets warm. What’s better economically and environmentally; this, or one of those under-sink boilers that dispenses instant hot water? Just for handwash and washing-up.