Solex Roofing Installation Manual 32
Solex Energy Ltd +44(0)1305 837223 www.solexenergy.co.uk
Systems retaining the existing cylinder
Retro-fit coil –
a retro-fit heat exchange coil is
fitted into the existing hot water cylinder by
removing the immersion heater. No change to
existing plumbing is required. The existing
cylinder should be of adequate size, and in
good condition. See the retro-fit coil section
below.
Second cylinder –
a new cylinder is installed,
with the solar roof indirectly heating the new
cylinder and another heat source indirectly
heating the existing cylinder. The cold feed is to
the solar preheat cylinder, and hot water is
taken from the second cylinder.
A three way valve is used to select water from
the solar cylinder or the existing cylinder,
controlled by a cylinder stat, set to the lowest
acceptable hot water temperature.
Second cylinder with pump mixing –
as an
alternative to valve control, a pump may be
used to mix the cylinders, controlled by a
cylinder stat. This has the advantage that both
cylinders can be heated by the solar input.
