Renewable heat from water, engineered around your site.

Scroll the picture sideways to see all of it. Every label is written out below.

1. 

   A house, and a pond at the bottom of the garden

   The house is drawn straight on. The pond is cut by the edge of the frame because it carries on; what matters is that the pipework between the two is buried and sealed the whole way.

2. 

   

   A sealed coil, lying on the bed

   One pipe, coiled and sealed at both ends, resting near the bottom of the pond where the water keeps its warmth longest. Both ends come back out together.

   • A single coiled pipe, sealed end to end
   • The loop turns round at the far end
   • Both ends join the pair
3. 

   

   Nothing is taken from the pond

   The water never enters the pipe and the fluid never enters the water. The pond is a little warmer than the fluid inside, so warmth crosses the pipe wall - and that is the whole of the exchange.

   • Warmth crosses the pipe wall
4. 

   

   Buried all the way to the house

   The pair of pipes leaves the bank and runs to the house in one shallow trench, the cooler one on its way out and the warmed one on its way in. The torn band is the drawing admitting how much of that run is not shown.

   • Buried trench to the house
   • Cooler fluid going out to the pond
   • Warmed fluid coming back
   • Underfloor heating in the screed
5. 

   

   Where the loop meets the machine

   The warmed fluid comes up into the heat pump and the cooled fluid goes straight back out to the pond. It never meets the water in your radiators - the two circuits only ever touch through a metal wall.

   • Heat pump
   • Underfloor manifold
   • Fuse board
   • Hot-water cylinder
   • Heating coil - heating water never mixes with your tap water
   • Cold water mains
6. 

   

   Inside the machine: four steps, over and over

   This is the only part of the whole picture that uses electricity. A sealed refrigerant goes round and round, and at each of the four stations it visibly changes.

   • Electricity from the grid
   1. 1 CollectevaporatorEnvironmental energy warms the refrigerant until it boils. It leaves as a warm gas at low pressure.
   2. 2 SqueezecompressorElectricity drives the compressor, squeezing that gas into a much smaller space. It leaves hot and at high pressure.
   3. 3 ReleasecondenserThe hot gas hands its heat to your heating water and condenses. It leaves as a hot liquid, still at high pressure.
   4. 4 Resetexpansion valveA valve drops the pressure and the liquid flashes cold. It leaves as a cold mist, ready to collect more.
7. 

   

   Where the heat actually goes

   Warm water runs to the pipes buried in the ground-floor screed, up to the radiator, and through a sealed coil inside the hot-water cylinder. Your tap water never touches it.

   • Radiator
   • Warm water out
   • Cooler water back
   • Your shower and taps

8. Three separate circuits. Heat passes between them; the fluids never mix.

   Source loop heat crosses here Refrigerant heat crosses here Heating water

   Nothing is taken from the pond. The water stays where it is - only its warmth is borrowed, and none of it ever reaches a radiator or a tap.