I love the twin tub!!
It's a heavy duty 7kg wash tub. We use a hose pipe to fill it from the sink in "conservatory". When we had the fire we lost all white goods and couldn't keep asking next door to wash as we're both on septic tanks. So we bought the TT. When all rebuilt, we got the 8kg automatic. That's hardly been used, but it's there if we need it. Minimum 1 hr wash.
Twin tub? 15 min to fill (hot water is slow) 15 min per wash, then spin, rinse etc. 3 loads in the time it takes to do 1 load! In winter with stove going, hot water on tap, constantly. In summer we use the gas.
Also very good for dog bedding, double duvets and sheep bedding (from when lambs reared in front room!) Also have a 6 ft airer suspended from the roof. We're old school here!