Application's Manual

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual | 21
9.1.1 830ES, 940ES/ESO, C1050ES, C1210ES/ESC intelligent
cascading with domestic hot water recirculation
For applications with 200ft of pipe or more.
System parameters:
• The plumbing must be connected in the reverse return method
with a minimum number of elbows to aid in balancing
pressures between the appliances.
• Locate appliances close together for improved performance.
- Maximum distance between appliances: 36”.
- Minimum distance between appliances: 1”.
• Minimum pipe diameter: ¾” (2 appliances or less).
• Minimum pipe diameter: 1” (3 appliances or more).
• Minimum water pressure: 50 psi.
• Insulate pipes to prevent heat loss.
cold
hot
hot
cold
Electric
buffer Tank
tankless link
cold
hot
inlet
outlet
Symbols
Service
valve
Pressure
relief
valve
Flow
direction
Tankless
link
Potable
water
expansion
tank
Note:
Drawing is not to scale.
cold
hot
cold
hot
tankless link
tankless link
Timer
Bronze or
stainless
steel
circulator
Domestic hot water
recirculation return line
Flow
check
valve
tankless link
Bosch 830 ES, Bosch 940 ES/ESO, Bosch C 1050 ES, or Bosch C 1210 ES
See Chapter 5 for recirculation pump parameters