Bosch Greenstar FS User Manual

One more puzzle solved.

New: Greenstar FS Series.

Replacing a boiler with a high eﬃciency boiler? Wall boilers are not the only option!

The 95% AFUE Greenstar FS series is designed to upgrade

cast iron ﬂoor boilers to a ultra-high eﬃcient condensing boiler

at lower installed cost by simplifying the installation.

Greenstar FS Series:

▶ Footprint: Fits in the same footprint as an existing ﬂoor boiler,

no added cost to build a wall or move the boiler to an outside wall

▶ Piping: Low loss header pre-piped “under-the-hood”, no need for

primary/secondary piping, pipes just like the existing boiler

▶ Wiring: Connection boxes (both high & low voltage) conveniently

located on the back of the boiler for quick and easy connection

▶ Venting: Options include 2” polypropylene (PP), ﬂexible PP chimney

liner, concentric PP kit, PVC or CPVC

SPECIAL FEATURES

▶ Control: Simpliﬁed control, no programming required

(FW200 control sold separately)

All Greenstar Models

▶ Broad BTU Range: Floor and Wall models with 95% AFUE and

up to 5:1 modulation are available in 5 Heat-Only and 3 Combi sizes

▶ Simpliﬁed Installation: Integral pump is standard on all models

▶ Coated Heat Exchanger: Prevents scale build-up, reduces service,

maintains high eﬃciency and extends the life of the boiler

▶ High DHW Output: Up to 4 GPM DHW output on combi models – based on ΔT at 72°F.

Large ﬂat-plate heat exchanger allows for lower operating temperatures and larger ΔT in DHW mode for higher eﬃciency and condensing operation

▶ Proven Reliability: Over 2 million Greenstar boilers sold worldwide

Bosch Greenstar — the world’s best selling condensing gas boiler — North America’s best value

§ Copies of original warranties in their entirety are available at www.boschheatingandcooling.com

NEW: Greenstar FS Series

Floor standing Combi or Heat-only boiler speciﬁcally designed for the replacement boiler market.

Expansion Vessel

(combi model only)

Digital Display Heatronic III

Boiler Control

Heating Temperature

Setting

DHW Temperature Setting

Fully Modulating Fan

Stainless Steel Burner

Electrode Assembly

Primary Sensor

Limit Stat

Al-Si Heat Exchanger

Gas Valve

Gas Connection

Heating

Supply & Return

Low Loss Header

Combustion Chamber Cover

Circulating Pump

Condensate Trap

DHW Supply & Return

(combi model only)

Levelling Legs

Combi Model Shown

Quick Reference Speciﬁcations

Floor Standing Models

Model Name KWB28-3 KWB35-3 KWB42-3 KBR16 -3 KBR21-3 KBR28-3 KBR35-3 KBR42-3

Part Number 7733600082 7733600083 7733600084 7733600077 7733600078 7733600079 7733600080 7733600081

Performance Speciﬁcations

Fuel NG / LP (LP conversion kit included) NG / LP (LP conversion kit included)

Input Ma ximum (MBH) 100.8 131.9 151.6 57.2 79.2 100.8 131.9 151.6

Input Minimum (MBH) 34.6 36.0 36.0 12.9 23.9 24.6 36.0 36.0

AFUE 95% 9 5% 95% 95% 95% 95% 95% 95%

DHW Fl ow Max (T at 72°F ), GPM 2.65 3.2 4.0 not applicable

Boiler We ight & Dims (W xHxD)

Supply / R eturn Tappings - 1/" Gas Connection Size - ¾” Vent connection 3" P VC

Domestic Water Supply ¾" not applicable

* Heat only Greenstar models may be used with indirect water tanks to provide domestic hot water.

Heating & Tankless Hot Water Heating*

Combi 10 0 Combi 131 Combi 151 57 79 100 131 151

136 lbs - 19 /" x 41" x 21 /" 132 lbs - 19 /" x 41" x 21 /"

Venting Options Optional Control

▶ 2" (50mm) or 3"(80 mm)

• Twin pipe PVC / CPVC

• M&G Duravent PolyPro & Centrotherm InnoFlue ▶ Twin pipe PP ▶ PP Flexible

▶ Concentric PP venting in a 3"/5" (80/125 mm)

is available from Bosch

Bosch Thermotechnology Corp. Londonderry, NH • Ft. Lauderdale, FL General Inquiries: 1-866-642-3198 Contractor Technical Support: 1-800-283-3787

www.boschheatingandcooling.com

The FW200 digital thermostat and outdoor

reset boiler control is an optional accessory

which enables the boiler to be operated

more eﬃciently by allowing the user to

optimize the heating system.

75H995076 02/2015