Installation guide

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COMBO System Capability
The following chart will assist in the selection of the COMBO
System that meets with your specific requirements.
Even if you have specified a basic COMBO System with a single
Bosch Continuous Flow Water Heater and the Everlast Accumulator
and then your hot water delivery requirements increase; or if the hot
water demand is not immediately known; this is a System where, if
required, a further Bosch Continuous Flow Water Heater may be
added.
HOT WATER DELIVERY CHART
COMBO with Bosch 17E, 21E or 25E Gas Heater Units & one
Everlast 250 Litre C2
Figures based on heating from 15 °C up to 65 °C (fairly typical)
COMBO
Unit Model
Heat up
Time
(mins)
Burner Size
(MJ / hour)
Tank
Capacity
(Litres)
First hour
delivery
(Litres)
Further hourly
delivery
(Litres/hr)
250117E 36 132 250 784 534
250121E 29 160 250 898 648
250125E 24 200 250 1060 810
** Notes for tables: Motel rooms will be a mixture of 1 bedrooms
with 1 or 2 people showering (business accom. is typically 1 person);
and 2 bedrooms with 2 or 3 persons showering. Therefore to average
at 2 persons per room is conservative, safe design.
These are scenarios ranging from small motel/hotel/unit
developments up to significant multi room accommodation; serviced
with very efficient hot water plant .
3 Star Accommodation equals 30 Litres per person per Peak Hour
5 Star Accommodation equals 45 Litres per person per Peak Hour
COMBO with Bosch 17E, 21E or 25E Gas Heater Units & one
Everlast 315 Litre C2
Figures based on heating from 15 °C up to 65 °C
(fairly typical)
COMBO
Unit Model
Heat up
Time
(mins)
First hour
delivery
(Litres)
Further
hourly
delivery
(Litres/hr)
Typical Number of
motel/hotel rooms assuming
2 persons per room
showering. **
3 STAR
ACCOM.
5 STAR
ACCOM
315117E 36 849 534 14 9
315121E 29 963 648 16 11
315125E 24 1125 810 19 13
[ Reference: Robert Bosch (Australia) Pty Ltd ]
COMBO Pipe and Fittings Sizing Guidelines
The Bosch-Everlast™COMBO Gas Hot Water System relies on the
Everlast Accumulator which will accommodate from one to 5 Bosch
Continuous Flow Water Heaters.
Specified in conjunction with the Grundfos UPS 32-80 B pump, a
system may be assembled with consistent pipe and fittings sizing.
The 50 mm sizing of Primary Circulation piping in the COMBO
design, ensures that the system will meet the range of major
commercial applications of single or multiple Gas units; manifolded to
the COMBO. Connection may be made using 50 mm direct coupling
as required. The factors to be considered by the Installer are the
mains supply piping/flow rates, and Secondary Circuit piping, if
required.
The following design principles should be considered in the
determination of the mains and secondary piping sizes :
If pipework is undersized for the required flow (litres/sec) or
(litres/min), then the velocity will increase (metres/sec) resulting in an
increased pressure loss. If pipework is oversized for the required
flow, then the heat loss will be increased.