Using ThermaTwin on an unvented (sealed) system
As ThermaTwin is designed to operate on an open vented system, it cannot be fitted onto a sealed or unvented system without additional intermediate components.
Replacing a recently installed or even new cylinder, just because it does not have a separate solar coil, makes no ecological or financial sense.
Help is at hand with the following simple retro-fit solutions.
We recommend the use of either:
a) A ThermaSyphon that isolates the ThermaTwin panel from the pressurised cylinder by using a separate chamber and
b) A ThermaPlug that replicates an electric immersion element heating the water instead of, or in addition to the back up electric immersion.