Cats in particular often drink more from moving water, and a fountain keeps the water circulating and filtered between top-ups. Running it from a battery means it can sit anywhere in the house, away from sockets and with no cable for a pet to chew.

The bowl is 304 stainless steel, BPA-free and holds 3.2L, which the maker says will keep one dog or two cats going for up to 15 days. A 5000mAh battery is listed to run it for 60 to 100 days. There are three modes: sensor, where water runs for 20 seconds when a pet comes within about 3 metres; timer, which runs for 20 seconds every 30 minutes; and continuous flow, which only works plugged in. Water passes through a 5-layer filter, and a window shows the level.

• Capacity: 3.2L
• 304 stainless steel bowl, dishwasher safe
• 5000mAh battery; charges in 2 to 3 hours at 5V 2A
• Three modes: sensor, timer and continuous (plugged in)
• About 23cm across and 11cm high
• Comes with 2 filters fitted, 4 spare filters, 2 sponges and a manual

Worth knowing: the maker recommends changing the sponge weekly and the filter every 4 weeks, so budget for replacements once the spares run out. Only the steel parts go in the dishwasher; keep the pump and battery unit dry.