Drainergy

 

The vertical model has a standard copper drainpipe with a rolled sleeve of sheet copper provides a vented double wall. The outer housing is a plastic PVC tube with water fittings. Between the sleeve and the housings is an O-ring gasket enclosing the annular space. Several washer-spacers distribute the cold water flow along the entire sleeve.

Drainergy: models with transparent housings

The horizontal model has an inner copper trough joined and sealed to an upper plastic segment and a trough of sheet copper provides a vented double wall. The outer housing is a plastic tube with water fittings in rotatable manifolds. An O-ring gasket spaces and seals the fresh water portion.

All materials are commonly available.

Fabrication requires only ordinary tools and skills.

Assembly requires no welding no soldering  no fasteners and no special skills.