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Seisco Tankless Water HeaterPurchase Online

Seisco Tankless Water HeatersAfter 14 years of research and testing, the SEISCO, whose technology has earned its developer 5 separate U.S. and many additional foreign patents, is recognized as the STANDARD for all tankless water heaters.

Selected as the water heater of choice for HUD's PATH Concept House.

The SEISCO tankless water heater has earned International recognition for providing the highest level of temperature control performance, reliability and safety in its operation over any tankless water heater anywhere in the world today.

Seisco models virtually eliminate standby heat loss and are over 99% thermally efficient compared to industry standard 40-gallon electric water heaters rated at about 92%. A standard 40-gallon tank type electric water heater loses about 2% of its stored energy to the surrounding environment every hour!

Residential
Space Heating
Commercial
Installation
Service and Troubleshooting
Download specifications for each model

Seisco Residential Side-by-Side Comparison

Seisco 4 chamber tankless water heater   RA-32, 240 volt is the high-end residential model for whole house water heating
Used in demanding applications where incoming water temperatures or total flow requirements dictate more power than the RA-28. (Minimum 200 AMP Whole House Electrical Service recommended). More info & price: Seisco RA32

Seisco 4 chamber tankless water heater   RA-28 - 208 and 240 volt - is the most popular residential model for whole house water heating
Sized to replace a 50 gallon tank water heater, providing endless hot water for most applications. Ideal companion to Solar and Geothermal passive heat recovery systems. (Minimum 150 AMP Whole House Electrical Service recommended). More info and price: Seisco RA28

Seisco 4 chamber tankless water heater   RA-24 is a 208 volt model for whole house water heating
Sized to replace a 30-50 gallon tank. Ideal for whole house & light commercial applications such as: offices, specialty restaurants, convenience stores, salons & pet-grooming (Minimum 150 AMP Whole House Electrical Service recommended). More info and price: Seisco RA24

Seisco 4 chamber tankless water heater   RA-22, 240 volt is ideal for the small house, apartment or condominium
Designed to fill the gap between the RA-28 and RA-18 where the electrical load may dictate a smaller unit (Minimum 150 AMP Whole House Electrical Service recommended). More info and price: Seisco RA22

Seisco 4 chamber tankless water heater   RA-18, 240 volt is the choice for warmer climates or smaller homes
Ideal for homes where incoming water temperatures rarely fall below 65°F. Well suited for smaller homes, apartments or condominiums in warmer climates. Can be used to serve individual, bathrooms, kitchens, spas or whirlpool tubs in larger homes. (Minimum 125 AMP Whole House Electrical Service recommended). More info and price: Seisco RA18
Seisco 2 chamger tankless water heater  


RA-16, 240 volt used for point-of-use applications at single sinks and showers. Perfect for beach houses, pool houses, hair salons, horse stables, hunting and fishing cabins. Use in places where the incoming water temperature never drops below 70° More info and price: Seisco RA16

Seisco 2 chamger tankless water heater  


RA-14 - 240 and 208 volt used for point-of-use applications at single sinks and shower
Perfect for beach houses, casitas and pool houses, hair salons, horse stables, hunting and fishing cabins. Use in places where the incoming water temperature never drops below 75° More info and price: Seisco RA14

 

Residential Models | Shop » Seisco Tankless Water Heaters | Download » Specifications

SEISCO Small Residential 2 Chamber Models
MODEL
RA-14
RA-16
Kw
14
16
Elements
7000 watts x 2
8000 watts x 2
Btu/hr
47780
54606
kg-cal/min
200
TEMPERATURE RISE
95 °F @ 1.0 GPM
64 °F @ 1.5 GPM
48 °F @ 2.0 GPM
52 F @ 2.0 GPM
38 °F @ 2.5 GPM
42 F @ 2.5 GPM
50 °C @ 4 L/min
33 °C @ 6 L/min
25 °C @ 8 L/min
27°C @ 8 L/min
 
20 °C @ 10 L/min
22°C @ 10 L/min
   
18°C @ 12 L/min
13C @ 16 L/min
MECHANICAL
Size HxWxD
15x 15x 10 in
40x 26x 15 cm
15x 15x 10 in
40x 26x 15 cm
Plumbing fittings
3/4-in NPT nipple x 2
3/4-in NPT nipple x 2
Shipping weight
15 lbs / 7 kg
15 lbs / 7 kg
ELECTRICAL
V
240 / 208
240
A (max)
58
67
Hz
50 / 60
Circuits
30A x 2
40A x 2

SEISCO Residential 4 Chamber Models
MODEL
RA-28
RA-24
RA-22
RA-18
KW
28
24
22
18
Elements
7000 watts x 4
7000 watts x 4
5500 watts x 4
4500 watts x 4
Btu/hr
95560
81,910
75080
61430
Kg-cal/min
400
315
258
TEMPERATURE RISE
95 F @ 2.0 GPM
81°F @ 2.0 GPM
75 F @ 2.0 GPM
61 F @ 2.0 GPM
76 F @ 2.5 GPM
65°F @ 2.5 GPM
60 F @ 2.5 GPM
49 F @ 2.5 GPM
64 F @ 3.0 GPM
54°F @ 3.0 GPM
50 F @ 3.0 GPM
40 F @ 3.0 GPM
48 F @ 4.0 GPM
30°F @ 4.0 GPM
37 F @ 4.0 GPM
30 F @ 4.0 GPM
50 C @ 8 L/min
42°C @ 8 LPM
39 C @ 8 L/min
32 C @ 8 L/min
40 C @ 10 L/min
34°C @ 10 LPM
31 C @ 10 L/min
26 C @ 10 L/min
33 C @ 12 L/min
27°C @ 12 LPM
26 C @ 12 L/min
21 C @ 12 L/min
25 C @ 16 L/min
21°C @ 16 LPM
20 C @ 16 L/min
16 C @ 16 L/min
MECHANICAL
Size HxWxD
15x 15x 6 in
40x 40x 16 cm
15x 15x 6 in
40x 40x 16 cm
15x 15x 6 in
40x 40x 16 cm
15x 15x 6 in
40x 40x 16 cm
Plumbing fittings
3/4-in NPT nipple x 2
3/4-in NPT nipple x 2
3/4-in NPT nipple x 2
3/4-in NPT nipple x 2
Shipping weight
23 lbs / 10.5 kg
23 lbs / 10.5 kg
23 lbs / 10.5 kg
23 lbs / 10.5 kg
ELECTRICAL
V
240/208
208
240
240
A (max)
116
115
91
75
Hz
50 / 60
50 / 60
50 / 60
Circuits
30A x 4
 
50A x 2
40A x 2
Service Amps*
150
150
150
150

* Minimum AMP whole-house electrical service recommended

More Info » For additional information, please download individual model Specification sheets

Shop » Seisco Tankless Water Heaters



Space Heating Models | Shop » Seisco SH Models | Download » Specifications

SEISCO SH Models for Space Heating
Model
SH05
SH07
SH09
SH11
SH12-208
SH14
SH18 SH22 SH24-208
SH28
Chamber
2 2 2 2 2 4/2 4 4 4 4
Heat
Output
[max]
BTU
17000 23890 30710 37540 40950 47780 61430 75080 81910 95560
Power
Rating
[max]
5kw 7kw 9kw 11kw 12kw 14kw 18kw 22kw 24kw 28kw
Voltage
Rating
Nominal
VAC
240 240 240 240 208 240/208 240 240 208 240/208
Current
Rating
[max]
21 amps 29 amps 37.5 amps 46 amps

58
amps

58 amps 75 amps 91 amps 115
amps
116 amps
Energy
Factor
0.99+ 0.99+ 0.99+ 0.99+ 0.99+ 0.99+ 0.99+ 0.99+ 0.99+ 0.99+
Heating
Elements
2500
watts
x 2
3500
watts
x 2
4500
watts
x 2
5500
watts
x 2
6000 watts x 2 3500
watts
x 4
4500 watts
x 4
5500
watts
x 4
6000 watts x 4 7000
watts
x 4
Circuits
Required
One
2-wire
w/
ground
One
2-wire
w/
ground
One
2-wire
w/
ground
One
2-wire
w/
ground
Two
2-wire w/
ground
Two
2-wire w/
ground
Two
2-wire w/
ground
Two
2-wire w/
ground
Four
2-wire
w/
ground
Four
2-wire
w/
ground
**
Breakers
Required
One
double
pole
One
double
pole
One
double
pole
One
double
pole
Two
double
pole
Two
double
pole
Two
double
pole
Two
double
pole
Four
double
pole
Four
double
pole
**
Breaker Size 30
amps
each
x 1
40
amps
each
x 1
50
amps
each
x 1
60
amps
each
x 1
40
amps
each
x 2
40
amps
each
x 2
50
amps
each
x 2
60
amps
each
x 2
40
amps
each
x 4
40
amps
each
x 4
Service Amps*
-
-
-
-
-
150/-
150
150
150
150
* Minimum AMP whole-house electrical service recommended

Flow Rating
Rise [Deg F] @ Flow [GPM]
Model
SH05
SH07
SH09
SH11
SH12
SH14
SH18 SH22 SH24
SH28

 

46 F
@
0.75
GPM

64 F
@
0.75 GPM

61 F
@
1.0 GPM

75 F
@
1.0 GPM

81 °F
@
1.0 GPM

95 F
@
1.0 GPM

61 F
@
2.0 GPM

75 F
@
2.0
GPM

81°F
@
2.0
GPM

95 F
@
2.0
GPM

 

34 F
@
1.0
GPM

48 F
@
1.0 GPM

40 F
@
1.5 GPM

75 F
@
1.0 GPM

54 °F
@
1.5 GPM

64 F
@
1.5 GPM

49 F
@
2.5 GPM

60 F
@
2.5 GPM

65 °F
@
2.5 GPM

76 F
@
2.5
GPM

 

23 F
@
1.5
GPM

32 F
@
1.5 GPM

30 F
@
2.0 GPM

37 F
@
2.0 GPM

41 °F
@
2.0 GPM

48 F
@
2.0 GPM

40 F
@
3.0 GPM

50 F
@
3.0 GPM

54 °F
@
3.0 GPM

64 F
@
3.0
GPM

 

17 F
@
2.0
GPM

24 F
@
2.0 GPM

24 F
@
2.5 GPM

30 F
@
2.5 GPM

32 °F
@
2.5 GPM

38 F
@
2.5 GPM

30 F
@
4.0 GPM

37 F
@
4.0 GPM

30°F
@
4.0 GPM

48 F
@
4.0
GPM

Rise [Deg C] @Flow [L/Min]
Model
SH05
SH07
SH09
SH11
SH12
SH14
SH18 SH22 SH24
SH28
 

24 C
@ 3 L/min

34 C
@ 3 L/min

32 C
@ 4
L/min

39 C
@ 4 L/min

42°C
@ 4 L/min

50 C
@ 4 L/min

32 C
@ 8 L/min

39 C
@ 8 L/min

42°C
@ 8 L/min

50 C
@ 8 L/min

 

18 C
@ 4 L/min

25 C @ 4
L/min

21 C @ 6 L/min

26 C @ 6 L/min

28°C @ 6 L/min

33 C @ 6 L/min

26 C @ 10 L/min

31 C @ 10 L/min

34 °C @ 10 L/min

40 C
@ 10 L/min

 

12 C
@ 6 L/min

17 C
@ 6 L/min

16 C @ 8 L/min

20 C @ 8 L/min

21 °C @ 8 L/min

25 C @ 8 L/min

21 C @ 12 L/min

26 C @ 12 L/min

27 °C @ 12 L/min

33 C
@ 12 L/min

 

9 C
@ 8 L/min

12 C @ 8 L/min

13 C @ 10 L/min

16 C @ 10 L/min

17°C @ 10 L/min

20 C @ 10 L/min

16 C @ 16 L/min

20 C @ 16 L/min

21 °C @ 16 L/min

25 C
@ 16 L/min

Dimensions
Model
SH05
SH07
SH09
SH11
SH12
SH14
SH18 SH22 SH24
SH28
Weight
15 lbs
7.0 kg
15 lbs
7.0 kg
15 lbs
7.0 kg
15 lbs
7.0 kg
15 lbs
7.0 kg
23 lbs
10.4 kg
23 lbs
10.4 kg
23 lbs
10.4 kg
23 lbs
10.4 kg
23 lbs
10.4 kg
Height
15"
400mm
15"
400mm
15"
400mm
15"
400mm
15¾"
400mm
15"
400mm
15"
400mm
15"
400mm
15¾"
400mm
15"
400mm
Width
10"
260 mm
10"
260 mm
10"
260 mm
10"
260 mm
10¾"
260 mm
15"
400mm
15"
400mm
15"
400mm
15¾"
400mm
15"
400mm
Depth 6
159mm
6
159mm
6
159mm
6
159mm

159mm
6
159mm
6
159mm
6
159mm

159mm
6
159mm
Fitting 3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
3/4"
200mm
*Optional one (1), 75 AMP circuit supply Check with manufacturer for jumpers that must be installed on control board for this option.

**Optional two (2), 75 AMP circuit supply Check with manufacturer for jumpers that must beinstalled on control board for this option.

More Info » For additional information, please download individual model Specification sheets

Shop » Seisco SH Space Heating Models

 

Commercial Models | Shop » Seisco CA Commercial Models | Download » Specifications

SEISCO Commercial Models Technical Specifications

Model

CA-5

CA-7

CA-9

CA-11

CA12
-208

CA-14

CA-18

CA-22

CA24
- 208

CA-28

CA-32

KW
Input

5

7

9

11

12

14

18

22

24

28

32

BTU
Input

17,065

23,891

30,717

37,543

40,950

47,782

61,434

75,086

81,910

95,564

109,211

A

10 1/4

10 1/4

10 1/4

10 1/4

10 1/4

10 1/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

B

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

15 3/4

C*

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

6 1/4

D

10 7/8

10 7/8

10 7/8

10 7/8

10 7/8

10 7/8

16 1/8

16 1/8

16 1/8

16 1/8

16 1/8

E

7

7

7

7

7

7

12 1/2

12 1/2

12 1/2

12 1/2

12 1/2

Weight
[lbs]

15

15

15

15

15

15

23

23

23

23

23

240
V. Amp.

20.8

29.2

37.5

45.8

58

58.3

75.0

91.7

115

116.7

133

# Elements

2

2

2

2

2

2

4

4

4

4

4

Element
KW

2.5

3.5

4.5

5.5

6

7

4.5

5.5

7

7

8

# Breakers
[240V]

1

1

1

1

1

2

2

2

4

4

4

Breaker
[amps]

25

30

40

50

60

30

40

50

30

30

40

Minimum Service Amps*

Requires one 30AMP, 240VAC electrical circuit

Requires one 30AMP, 240VAC electrical circuit

Requires one 40AMP, 240VAC electrical circuit

Requires one 50AMP, 240VAC electrical circuit

Requires one 60AMP or two 30AMP, 208VAC electrical circuits

-

-

150

150

150

200


* Minimum AMP whole-house electrical service recommended

More Info » For additional information, please download individual model Specification sheets

Shop » Seisco CA Commercial Models

 



Seisco Installation

INSTALLATION

Service Troubleshooting

Mounting and Clearance Requirements

Plumbing Tankless Water Heater Installation

Electrical Tankless Water Heater Installation

download pdf Download Installation & Service Guide

PLUMBING

ELECTRICAL GUIDE

DIAGNOSTICS

DIAGNOSTICS CODES

COMPONENT TESTING

Service and Troubleshooting

Removal & Repair Guide

download pdf Download REMOVAL AND REPAIR Guide in PDF Format

Downloads


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