The Moonstone Project, Aquatron 4×300

The Moonstone Project: “To design and build Britain’s leading autonomous Eco-house”. Leigh och John Croft built their Eco house east of Sheltenham. This house has nine toilets connected to their Aquatron system. The toilet most far from the separator is 50 meters away.


To be the best Eco house in the Country, innovative and often untried technologies had to be used in its construction.
The whole building now has levels of insulation 65% better than the very Best German Eco standard of the Passiv Haus—U values of the walls of 0.06 w/m2K cf. 0.15 w/m2K.

Full commercial quarrying equipment was brought in to excavate and process all 12,000 tonnes of Cotswold stone material on site. All this material was recycled in the battered wall construction or for hardcore for the
driveways. The only building waste removed from site was in three 8 cubic yard skips.

A Canadian ICF (Insulated Concrete Formwork) was used with water proof concrete—to provide a water proof underground basement and water proof tanking to a third of the building which was
Large Hanson 200mm and 300mm thick 7m long x 1.2m wide floor panels had to be craned into position.
Highly insulated triple glazed windows with a U value = 0.7 w/m2K were imported from Germany
Walls were constructed with a 1m thick Cotswold stone battered wall with a 3 degree pitch with super insulation of 400mm of extruded polystyrene to totally fill the cavities. All ground floors were built on 300mm of heavy
duty insulation
The inner wall was treated with a epoxy tanking materials and the full height of the walls dressed with a 4mm neoprene jacket to create an air and water tight structure.

Eight bore holes and a further 1 1 /2 miles of 40mm pipe was buried around the property t o provide heating to the 12Kw Ground source heat pump.
A 44 square metre arrangement of flat plate solar thermal panels provide the house with 85% of its hot water and heating requirements.

All drinking and other water requirements are met by an on site spring
Rain water is collected from the roofs and discharged via pipe work hidden in the walls and used to fill reflection and infinity pools at the extremities of the building

A two tier vertical reed bed was constructed to process all waste water on site—to drinking quality standard.
An Aquatron worm biogester unit composts all solid wastes from toilets and waste food and is then re-used as compost

The house was the first domestic property in the UK to use Rehau Earth pipes installed 3 metres below ground. Via this pipe work incoming air is ducted through 6 lengths of 50m underground Earth pipes pre-warming the air in the winter months and cooling it in the summer months.

A full mechanical heat recovery system, filters and purifies all incoming air into the property and recovers wasted heat from the kitchen, bathrooms, tumble dryer and Aquatron bio-gester.
The house is illuminated with LED lighting saving an additional 60% over normal energy efficient lighting.A CLIPSAL lighting and automation system was fitted into the house, with PIR’s switching lights on and off when necessary and all lighting circuits are set on timers with occupancy detection to save further electricity.

A Schluter super thin 25mm screed underfloor heating system, provides rapid heating comparable with traditional radiators and traditional underfloor systems. The very thin Supa flow liquid screed only needs an input temperature of 35 degrees to reach a room temperature of 21 degrees, making it perfect for the small Ground source heat pump.


Two 1500 litre stratified hot water thermal storage cylinders have multiple inputs allowing for easily connection of solar thermal, ground source heat pumps and other renewable energies.
The 3000 litre hot water storage covers the house for approximately 7 days, with any short fall being met by the Ground source heat pump.





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