Econergy Installation Manual Rev G 240914
© Hot Water Heat Pumps Ltd 2018
12/03/2018
www.econergy.co.nz
6
Heat Pump Water Heater Installation Guide
Econergy
®
units can be combined with wetback systems but only with strict
constraints as the temperature limit on the Econergy
®
water heater is 80°C. The
Econergy
®
water heater unit must be mounted level with the hot water cylinder
or below, and the piping designed to eliminate a thermosyhon loop to stop the
possibility of over temperature hot water circulating from the cylinder to the unit.
Solar Water Heating Systems
Solar water heating systems, like wetback systems, are usually uncontrolled
systems. Temperatures can rise to 100°C, boiling the water. As the Econergy
®
system is super efficient it would not normally be required to integrate the unit
with a solar water heating system, however if this was specified or required
by the customer then the piping design (as per wetback) must be designed
to avoid thermosyphoning of high temperature water through the unit while
not running.
Hot Water Cylinders
The Econergy
®
water heater requires a well insulated hot water cylinder to
function correctly. The tank must be sized to the maximum anticipated draw
off in an 8 hour period so that the consumer does not run out of hot water.
As a guide, we recommend 300L for a family of 4. The water heater unit can
be retrofitted to any electric cylinder as long as it has PU or EPS insulation.
Econergy
®
water heaters cannot be installed into gas HWC’s as they are
generally inefficient and there is no electrical backup.
Econergy Heat Pump Ready HWC - Recommended Storage Sizes
Household Size
# Adults
Recommended Size Ordering Code
2
180L
EC180L
3
250L
EC250L
4-6
300L
EC300L
6+ / high use
350L +
EC [capacity]L Custom
The Econergy
®
system cannot be used with a solar
water heating system where the piping design
allows a thermosyphon loop to develop
!