First time I've heard of The Everhot.
Not as good as the old solid-fuel WHF version of the AGA which would heat domestic hot water continuously as well as cook, bake and warm the kitchen simultaneously. In the days when home-grown phurnacite/anthracite and coal were inexpensive, but that benefit was abandoned in 2014 when oil, gas and electric AGAs became the norm.
Even electricity-driven Everhots are just cookers which don't provide domestic hot water, so you would need a gas/oil heater or other device, say heat pump maybe, for that purpose.