It has two – one to heat the water, another to warm the butt of the thermos flask. I suspect the butt warmer has gone, it's had a decade-plus of being dripped on and other terrible abuse. Not to mention the time I forgot to put the filter in and the water just came out of the top and flooded the machine and surrounding kitchen. That was a good morning.
Unless it's a particularly posh one it's all done by the one element in the hot plate, which is also the water pump, via the magic of steam expansion and a non-return valve stopping it going back into the tank.
Indeed, that seems to be the case, the element does double duty of warming the flask while heating the water (and then turns off leaving the thermos to keep everything warm (thus avoiding that nasty burned coffee taste that turns you into a twice-divorced and on-the-take police officer).
I would, of course, fix it using my screwdriver skills but my wife has hidden all the tools and I have no clue (yeah, but who made the electricity come back on, me, that's who). These coffeebots (a Cuisinart Grind & Brew Plus) seem to last precisely ten years, I remember splurging (at the time) my first ever UK bonus (or £130 of it) on the first one in 2002 which died (I forget how) in 2012, hence this one. Ten years probably isn't bad for a modern appliance and I'm terrible at exciting stuff like descaling. If it ain't broke, I don't fix it, given my attempt to fix anything generally just further the brokenness. That said, I've reached a detente with the dishwasher which stopped behaving for a while, but I've now found tends to work if press the buttons in a certain order and close my eyes before pressing the start button. One of the lessons of pikey parentage is that I absolutely won't replace anything until it's dead (or a bloke down the pub offers me a one-careless-owner replacement for £5).
So, new coffeebot ordered. I will commit to descaling this one at least a decade whether it needs it or not.
Let's not ask why my wife's office is on the same circuit as the kitchen and not the upstairs. At least the shower pump didn't go off.