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Appliance details
2 Appliance details
2.1 Features
Parts
• Touch Pad interface control
• High power pre-mix compact burner with low Nox
emissions
• Modulating Gas Valve with constant gas:air ratio
control
• Modulating water valve for improved comfort and
temperature control.
Safety
• Flame sensor (ionization) rod
• Overheat sensor
• Temperature limiter
• Fan speed monitoring.
High Quality Materials for Long Working Life
• Copper heat exchanger
• Ceramic Burner output
• Automatic overheating protection shut-off sensor
• Compact space saver: mounts on a wall with a
supplied bracket.
• Easily removable one-piece cover.
Features
• LCD Display
• On/Off and Temperature control switches
• Reset button
• Program Key (Selectable temperature default)
• Failure codes for easy diagnostic and repair.
Accessories
• Optional wireless remote control accessory to
operate with the appliance
• Vent termination kit.
2.2 250 SX Specifications (Technical
data)
Approved in US/Canada
Capacity
Maximum flow rate: 6.35 GPM (24 l/min) at a 45°F
(25°C) rise.
Maximum output
142,968 Btu/h (41.8 kW)
Maximum input
175,000 Btu/h (51.2 kW)
Efficiency in %
Recovery efficiency 86.5%
Min. Output
31,131 Btu/h (9.1 kW)
Temperature Control
Selection range: 100°F (38°C) - 140°F (60°C)
Default temperature: 122°F (50°C)
Stability: +/- 2°F (+/- 1°C)
Gas Requirement
Gas connection (inches) - ¾”
Inlet gas pressure under operation (with a high hot
water flow rate)*
• Propane: 11” - 14” water column
• Natural Gas: 5” - 14” water column
• Gas pressure measuring point inside the appliance
at the gas valve inlet.
* Testing with a manometer, operate other gas
equipment on the same gas supply. Gas pressures
lower than 5" W.C. for Natural Gas or 11" W.C. for
LPG will result in insufficient degree rise to the hot
water being used. See Measuring Gas Pressure,
chapter 2.12.
Fig. 3 Gas pressure measuring point
Venting
See chapter 2.9 for Venting on page 9.
Water
• Hot water connection (inches) - ¾”
• Cold water connection (inches) - ¾”
• Water valve material: Polymer (PPS) (Polypropylene
Sulfid)
• Minimum water flow: 0.8 gallon/minute (3 l/m)
i
BOSCH is constantly improving its
products, therefore specifications are
subject to change without prior notice.