I use a counter top RO system by osmio. Change filters once a year and use it as an instant hot water/kettle. Not what you're looking for but they also do whole house systems. Other companies and solutions exist so you should be able to find a solution for your needs. Eg My mate has a small bin size unit in his utility where his water supply enters.
www.osmiowater.co.uk
Whole House Filtration Systems
Whole House Water Filter Systems to filter all the water you use in your home. Buy Quality Water Filtration Products that enhance Health and Wellbeing for the home and workplace kitchen.
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