John,Gaymar is a new name to me , but there a lot of their MTA 4700 units for sale in the USA. It is the very thing I'm after, but the shipping costs are likely to be a bit steep for something so bulky and weighty. The other names/models I have come across are - Jostra HCU 30, Grant Flow Heaters, Julabo FE 500, Stockert S111.If anyone is familiar with any of them, please let me know.Thanks for your help.