DavecUK I switch the boilers off and wrap a tea towel on the group when I switch the machine off during the day, so that when I turn the machine on again it warms up a bit faster - the boilers themselves only take 7 minutes to warm up from 25 degrees, so I turn them on later.
I’ve been thinking that - unless I’m experimenting with different brewing temperatures - I’d like something a bit more permanent and insulating than a tea towel - a wood box or a 3-d plastic shell? If others are interested, maybe we can make a small lot.
(BTW - double the temp, 16 times the heat loss according to Stefan-Boltzmann)