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Seisco Tankless Water Heater

After 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
		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
		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
		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
		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
		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
		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
		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
		13°C @ 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	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm
Width	10¾" 260 mm	10¾" 260 mm	10¾" 260 mm	10¾" 260 mm	10¾" 260 mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm	15¾" 400mm
Depth	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 159mm	6¼ 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

HUD rules for manufactured housing

Temperature and pressure valves

Suggested clearances

Plumbing Tankless Water Heater Installation

Plumbing connections

Electrical Tankless Water Heater Installation

Connection to power supply

Functional checks

Download Installation & Service Guide