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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?

Flow switches:
A selection at Hawco http://www.hawco.co.uk, but have a £75 min order.
Try RS: http://www.rswww.com

Farnell http://www.farnell.co.uk)

Also: http://www.axdistribution.com/FluidM...ow_switchs.htm

Flow switches from Farnell:
FS-05 (3A contacts) 3/4" BSP - £16
FS-01 (3A contacts) 22mm compression £31.92. Twice the price for
compression joints.

Data sheets:
http://www.farnell.com/datasheets/28551.pdf