What tips do you have for keeping fleece washing water hot?

When I was processing wool in utility sinks in my garage, at my last house, this is what I did to keep the water hot during the washing process:

Wrap the sinks in insulation, and when they have the hot water in them, cover them with a sheet of the stiff foam insulation.

I started out with my sinks at 180 F, and with this insulation, kept them above 165 for at least half an hour.

(Getting the sinks to 180 F -- 1/2 fill with hottest water heater water, 1/2 fill with boiling water)

(posted by me on spindlers this day)

The picture is fleece from Sitka, a Cotswold Ram, spread out on my skirting table.

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