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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
• High efficiency Ceramat Burner
• 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.
BOSCH is constantly improving its
i
products, therefore specifications are
subject to change without prior notice.
4
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.
* To measure Gas Pressure, see Measuring Gas
Pressure, chapter 2.12.
Venting
A condensate trap is integrated into the exhaust flue
gas collar of the heater, the supplied condensate drain
tube must be installed to it for proper removal of
condensate from the trap. 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)
• Minimum recommended water pressure: 30 PSI
(2.07 bar)
• Connections:
– Bottom of heater
6 720 607 057
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