https://www.tomsguide.com/reviews/ecoflow-wave-2
newer model available for around £1200 – but you can get the refurbished wave 2 online for £454 on ebay which is a fantastic price – https://www.ebay.co.uk/itm/317093222922? (from ecoflow themselves)
buying 2 of these 1 in the office and another for the hardest to heat room in the house could save us a lot of money heating the house.