Water saving technology

Thames Water has just completed a trial of water saving toilets at one of their offices. They have replaced five existing toilets which used an average of 6.2 litres per flush with toilets from Propelair that use only 1.5 litres per flush. Combined with water sensors on taps and urinals, they have managed to reduce consumption by 606,000 litres per year, saving approximately £1,600 per year. Thames Water now plan to install the Propelair toilets in their three largest offices and expect to save 10 million litres of water and £10,000 per year as a result.

Installing replacement toilets can be very cost effective. All Propelair toilets are on the Water Technology List so attract tax relief under the Enhanced Capital Allowance scheme. Tax relief on the capital cost can also be claimed against Annual Investment Allowance. Finally, Propelair have a lease scheme which allows them to supply the toilet free of charge and use , using the monthly savings to pay for the installation.


Tesla Power Wall battery for solar PV systems

A big drawback with installing solar PV systems to generate electricity is the limited ability to store surplus energy for use at a later data. Battery technology is currently a hot bed of development and Tesla have beaten most competitors to the market with the launch last year of the Tesla Power Wall battery. Designed to work directly with solar PV systems, each unit can store up to 14 kWh of surplus electricity and costs approximately £6,500 to install. A standard 3 bedroom house with one Power Wall unit linked to a 4 kW solar PV array would generate and store enough electricity for 75% of daily demand. A 10 kWp and two Power Walls would make the house completely independent of mains electricity. See more details at: https://www.tesla.com/en_GB/powerwall