Bosch SST450-119 Specifications download pdf (Page 6)

Indirect Fired Water Heaters Installation and Operating Manual

Installation & Operating Manual

1 General Information

The SST series indirect water heater (FIG. 1-1) is designed

to generate domestic hot water in conjunction with a hot

water boiler using forced boiler water circulation. This

indirect water heater consists of a 316L Stainless Steel

tank in which a smooth 304L stainless steel coil is located

(Table 1A). Boiler water is pumped through the coil and

heats the water in the tank. This tank is not intended for

use in pool heating applications or for heating any ﬂ uid

other than water. It is also not intended for use in gravity

hot water heating systems.

Operating Restrictions:

• Maximum domestic hot water temperature is 194°F.

• Maximum boiler water temperature is 210°F.

• Maximum working pressure for the vessel tank is 150

psig.

Component Materials Table 1A

Component Material

Tank 316L Steel Stainless Steel

Coil 304L Stainless Steel

Insulation Polyurethane

Jacket Polypropylene/ABS

“E”

“A”

“B”

“C”

“D”

22.5°

45°

“F”

1-1/2” NPT (SEE NOTE 1)

1” NPT

AQUASTAT/SENSOR WELL

NOTES:

1. 1” NPT ON SST150-40.

1. RELIEF VALVE CONNECTION

2. HOT WATER OUTLET

3. BOILER WATER IN

4. BOILER WATER OUT

5. DRAIN/COLD WATER INLET

3/4” NPT

1-1/2” NPT (SEE NOTE 1)

SST150 - SST450

PART NO.

“A”

(in.)

“B”

(in.)

“C”

(in.)

“D”

(in.)

“E”

(in.)

“F”

(in.)

SST150-40

SST250-65

SST300-80

SST450-119

3 1/4

8 1/4

9 1/4

25 1/4

31 3/4

48 1/2

52 1/2

61 3/4

60 1/4

WEIGHT

FULL OF WATER

(lbs.)

515

820

921

1268

Figure 1-1

Single-Wall Heat Exchanger

National Standard Plumbing Code

Single-wall heat exchangers in water heaters comply with

the National Standard Plumbing Code provided that:

• boiler water (including additives) is practically non-toxic,

having a toxicity rating or class of 1, as listed in Clinical

Toxicology of Commercial Products, and

• boiler water pressure is limited to a maximum of 30 psig

by approved relief valve.

Uniform Plumbing Code

Single-wall heat exchangers are permitted if they satisfy all

of the following requirements:

1. The heat transfer medium is potable water or contains

only substances which are recognized as safe by the

U.S. Food and Drug Administration.

2. The pressure of the heat transfer medium is maintained

less than the normal minimum operating pressure of the

potable water system.

3. The equipment is permanently labeled to indicate that

only additives recognized as safe by the FDA shall be

used in the heat transfer medium.

Other heat exchanger designs may be permitted where

approved by local code.

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