10
Typical DHW cylinder set up (standard DHW cylinder or Combi
-
tank)
It is important to use a cylinder that is fit for purpose. A heat pump delivers coil input at a much lower
temperature and transfers heat with a much lower differential between the body of water and the heating
coil compared to a boiler, wetback or solar.
The coil in a cylinder used with a heat pump must have
considerably larger surface area to enable effective heat transfer
. If you have a dual coil cylinder you
may connect the two coils together in series for improved input performance
There is nothing to gain from over sizing a DHW cylinder in a heat pump system, a 250L cylinder would be
more than adequate for most homes.
Shown above are a Typical DHW cylinder, and the Heat IQ Eco+ combi tank
Using the conventional cylinder
•
The cylinder is piped via a three
-
way valve from the primary flow and return. these connections for the
cylinder coil F/R are made in the line before the hydraulic separator or buffer tank.
Using the Eco+ Combi tank
•
Designed to optimise the energy efficiency of the system in this format a buffer tank within the cylinder
shell has a coil used as a pre heater for DHW. By doing so Combi
-
Tank® utilises the higher COP energy
from the buffer reducing the requirement for lower COP input through the three way valve to cylinder
coil.
•
The efficient option for any system, Combi
-
Tank® also allows the system the option to input
solar PV
energy into both the DHW and the Heating system via elements, for even greater energy efficiency.
•
Having both the Buffer tank and Cylinder within a single shell simplifies installation and keeps the system
neat while using less space.
•
Combi
-
Tank® can also be installed with the optional management module for further energy saving
features and user options.
(See Combi
-
Tank manual/brochure)
*When including a Combi
-
tank® please refer to the specific element control
options in the Combi Tank installation instructions.
PV Ready
Optional