The robot cleaners we have tidying up our houses in the 21st century continue to get smarter and more efficient – such as the Narwal, which combines both vacuuming and mopping in one device, and can even replenish its own water tanks when it's done.

That all-in-one self-maintenance is sure to appeal to a lot of potential buyers, which helps explain why the device has raised almost 20 times its original goal on Kickstarter (and counting). Backing products on the crowdfunding site doesn't always guarantee getting some hardware at the end of it, but the Narwal looks as safe a bet as any.

With a 1800Pa motor on board, the Narwal promises strong and effective suction for dust and dirt, but it's really the mopping where this gadget excels. The device developers promise the Narwal can clean three times as efficiently as other robot mops, with two rounded triangle spin mops doing the dirty work.