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Anyone know where I can get a 50-100kW plate heat exhanger and flow switch
suitable for diy-ing (natch :-) a thermal store heat exchanger system at a
reasonable (i.e. low) price? DPS want about 100 for the heat x, 30 for the
switch, + VAT. Anywhere I could get a better price?

Try the on-line boiler spares sites. A couple of cheap combi plate heat
exchangers in parallel will probably do, and may work out far cheaper as
well.