[Strata Cleaning]

Nothing new but might be useful to someone not yet aware.
It covers water as well as energy saving  products. they are listed on:
http://www.watertechnologylist.co.uk/search.asp?section=66
and
https://www.gov.uk/guidance/energy-technology-list

''Enhanced Capital Allowance 

The Enhanced Capital Allowance (ECA) water scheme encourages businesses to invest in technologies that save water and improve water quality. The scheme enables your business to claim 100% first-year allowances, i.e. tax relief, on investments in certain technologies and products

Claiming an ECA means that you can write off (deduct) the whole cost* of purchasing a qualifying water-efficient technology against your taxable profits in the year you made the purchase''

more here:

https://www.gov.uk/government/publications/water-efficient-enhanced-capital-allowances

[Smurf]

Pity there are no super heated water doff type systems on that list