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Water Heaters Comparison Chart
Kuuma Heat Transfer Products Isotemp Raritan Seaward
Catalog#   Product Description Model# Price  
Kuuma top
501145
6 Gallon Water Heater With Rear Heat Exchanger 
6 Gallon Water Heater With Rear Heat Exchanger 
Front / back mount heater with aluminum alloy casing
120V, 1500W, 13.6"L x 20"W x 13.6"H
40603
List Price:
$246.00
Our Price:
$229.99
502573
6 Gallon Water Heater With Front Heat Exchanger 
6 Gallon Water Heater With Front Heat Exchanger 
Side mount heater with aluminum alloy casing
120 Volt / 1500 Watt, 15.5"W x 19.5"D x 13.6"H
40600
List Price:
$246.00
Our Price:
$229.99
502450
11 Gallon Water Heater With Front Heat Exchanger
11 Gallon Water Heater With Front Heat Exchanger
Side mount heater with aluminum alloy casing
120V, 1500W, 18.75"W x 22"D x 16"H
411001
 
Our Price:
$279.99
502574
6 Gallon Water Heater With Front Heat Exchanger 
6 Gallon Water Heater With Front Heat Exchanger 
Front / back mount heater with aluminum alloy casing
120 Volt / 1500 Watt, 13.6"W x 20"D x 13.6"H
40601
List Price:
$246.00
Our Price:
$229.99
502575
11 Gallon Water Heater With Front Heat Exchanger 
11 Gallon Water Heater With Front Heat Exchanger 
Side mount heater with aluminum alloy casing
120 Volt / 1500 Watt, 18.75"W x 22.5"D x 16"H
41100
List Price:
$306.00
Our Price:
$279.99
502576
11 Gallon Water Heater With Front Heat Exchanger 
11 Gallon Water Heater With Front Heat Exchanger 
Front / back mount heater with aluminum alloy casing
120 Volt / 1500 Watt, 16"W x 22.5"D x 16"H
41101
List Price:
$306.00
Our Price:
$279.99
502577
20 Gallon Water Heater With Front Heat Exchanger 
20 Gallon Water Heater With Front Heat Exchanger 
Vertical / cross mount heater with aluminum alloy casing
120 Volt / 1500 Watt, 18.75"L x 18.75"W x 29.5"H
41800
List Price:
$460.00
Our Price:
$399.99
Heat Transfer Products top
500182
SuperStor Water Heater 
SuperStor Water Heater 
6 Gallon, 120V, 1500W, 14.25" Dia x 16.5" H;
With heat exchanger, stainless steel
SS6M
 
Our Price:
$566.99
500183
SuperStor Water Heater 
SuperStor Water Heater 
12 Gallon, 120V, 1500W, 16.25" Dia x 19" H;
With heat exchanger, stainless steel
SS12M
 
Our Price:
$629.70
500184
SuperStor Water Heater 
SuperStor Water Heater 
20 Gallon, 120V, 1500W, 19" Dia x 27" H;
With heat exchanger, stainless steel
SS20M
List Price:
$1716.00
Our Price:
$839.99
Isotemp top
502537
Isotemp Basic 24 Water Heater 
Isotemp Basic 24 Water Heater 
6.4 Gallon, 115V, 750W, 19.31"L x 15.56"Dia
With heat exchanger, stainless steel
602421B000003
 
Our Price:
$639.99
502538
Isotemp Basic 40 Water Heater 
Isotemp Basic 40 Water Heater 
11 Gallon, 115V, 750W, 26"L x 15.56"Dia
With heat exchanger, stainless steel
604021B000003
List Price:
$1024.00
Our Price:
$729.99
502702
Slimline 15 Water Heater 
Slimline 15 Water Heater 
4 Gallons, 115V, 750W, 21.25"L x 11.38"Dia
With heat exchanger, stainless steel
601521S000003
 
Our Price:
$599.99
502704
Slimline 25 Water Heater 
Slimline 25 Water Heater 
6.5 Gallons, 115V, 750W, 30.88"L x 11.38"Dia
With heat exchanger, stainless steel
602521S000006
 
Our Price:
$649.99
402111
Slim Square Water Heater 
Slim Square Water Heater 
4.2 Gallons, 115V, 750W, 23.75"L x 7.94"W x 15.75"H
With heat exchanger, stainless steel
601623Q000003
List Price:
$838.00
Our Price:
$689.99
502539
Isotemp Basic 50 Water Heater 
Isotemp Basic 50 Water Heater 
13 gallon, 115V, 750W, 30.69"L x 15.56"Dia
With heat exchanger, stainless steel
605021B000003
List Price:
$988.00
Our Price:
$779.99
502540
Isotemp Basic 75 Water Heater 
Isotemp Basic 75 Water Heater 
20 gallon, 115V, 750W, 42.13"L x 15.56"Dia
With heat exchanger, stainless steel
607521B000003
List Price:
$1177.00
Our Price:
$929.99
502703
Slimline 20 Stainless Steel Water Heater 
Slimline 20 Stainless Steel Water Heater 
115 Volt with heat exchanger
5.3 Gallon / 15 Liter
602021s00003
 
Our Price:
$614.99
501177
Slim Square Water Heater - English Version 
Slim Square Water Heater - English Version 
16 Liters, 230V, 750W, 400H x 180W x 575D (mm)
With heat exchanger, stainless steel
601633Q000003
List Price:
$864.00
Our Price:
$699.99
502706
Slimline 20 Stainless Steel Water Heater 
Slimline 20 Stainless Steel Water Heater 
230 Volt with heat exchanger
5.3 Gallon / 15 Liter
602031S00003
 
Our Price:
$639.99
502705
Slim 25 Water Heater - English Version 
Slim 25 Water Heater - English Version 
25 Liters, 230V, 750W, 750 x 295 mm
With heat exchanger, stainless steel
602531S000003
 
Our Price:
$674.99
Raritan top
500175
Water Heater 
Water Heater 
6 Gallon, 120V, 1250W, 14-1/2" Dia x 16-1/4"H
Without heat exchanger, glass-lined steel
170601
 
Our Price:
$569.99
500176
Water Heater 
Water Heater 
12 Gallons, 120V, 1250W, 18-3/4" Dia x 16-1/4"H
Without heat exchanger, glass-lined steel
171201
 
Our Price:
$619.99
500177
Water Heater 
Water Heater 
20 Gallons, 120V, 1250W, 18-3/4" Dia x 24-1/4"H
Without heat exchanger, glass-lined steel
172001
 
Our Price:
$629.99
500178
Water Heater 
Water Heater 
6 Gallons, 120V, 1250W, 14-1/2" Dia x 16-1/4"H
With heat exchanger, glass-lined steel
170611
 
Our Price:
$619.99
500179
Water Heater 
Water Heater 
12 Gallons, 120V, 1250W, 18-3/4" Dia x 16-1/4"H
With heat exchanger, glass-lined steel
171211
List Price:
$1012.00
Our Price:
$669.99
501204
Water Heater 
Water Heater 
20 Gallon, 240V, 1250W, 18-3/4" Dia x 24-1/4"H
Without a heat exchanger, glass-lined steel
172002
List Price:
$975.00
Our Price:
$729.99
500180
Water Heater 
Water Heater 
20 Gallon, 120V, 1250W, 18-3/4" Dia x 24-1/4"H
With heat exchanger, glass-lined steel
172011
List Price:
$1044.00
Our Price:
$699.99
Seaward top
500190
Water Heater 
Water Heater 
6 Gallons, 120V, 1500W, 13"W x 19"D x 13"H
With rear heat exchanger, galvanized steel, horizontal
S600
 
Our Price:
$214.99
500191
Water Heater 
Water Heater 
6 Gallons, 120V, 1500W, 13"W x 19"D x 13"H
With rear heat exchanger, stainless steel, horizontal
S700
 
Our Price:
$299.99
500192
Water Heater 
Water Heater 
11 Gallons, 120V, 1500W, 16"W x 22"D x 16"H
With rear heat exchanger, galvanized steel, horizontal
S1100
 
Our Price:
$289.99
502533
Water Heater 
Water Heater 
6 Gallons, 120V, 1500W, 13"W x 19"D x 13"H
With front heat exchanger, galvanized steel, horizontal
F600
 
Our Price:
$199.99
500193
Water Heater 
Water Heater 
11 Gallons, 120V, 1500W, 16"W x 22"D x 16"H
With rear heat exchanger, stainless steel, horizontal
S1200
 
Our Price:
$349.99
501182
Water Heater 
Water Heater 
3 Gallons, 120V, 1500W, 14-1/2"W x 14"D x 13"H
With side heat exchanger, painted aluminum, horizontal
S-300W
 
Our Price:
$259.99
500510
Water Heater 
Water Heater 
20 Gallons, 120V, 1500W, 20-1/4"W x 20-1/4"D x 27"H
With front heat exchanger, stainless steel, vertical
S1900
 
Our Price:
$449.99
502545
Water Heater 
Water Heater 
6 Gallons, 120V, 1500W, 13"W x 19"D x 13"H
With front heat exchanger, stainless steel, horizontal
F700
 
Our Price:
$299.99
502546
Water Heater 
Water Heater 
11 Gallons, 120V, 1500W, 16"W x 22"D x 16"H
With front heat exchanger, galvanized steel, horizontal
F1100
 
Our Price:
$279.99
502547
Water Heater 
Water Heater 
20 Gallons, 120V, 1500W, 20-1/4"W x 20-1/4"D x 27"
With front heat exchanger, galvanized steel, vertical
S1800
 
Our Price:
$349.99
502548
Water Heater 
Water Heater 
28 Gallons, 240V, 1500W, 16"W x 40"D x 16"H
Without heat exchanger, painted aluminum, horizontal
H2850
 
Our Price:
$529.99
502552
Water Heater 
Water Heater 
11 Gallons, 120V, 1500W, 16"W x 22"D x 16"H
With front heat exchanger, stainless steel, horizontal
F1200
 
Our Price:
$349.99
502553
Water Heater 
Water Heater 
6 Gallons, 240V, 1500W, 13"W x 13"D x 19"H
With front heat exchanger, galvanized steel, horizontal
F650
 
Our Price:
$249.99
502578
Water Heater 
Water Heater 
20 gallons, 120 Volt, 16" w x 32" d x 16"
Galvanized Horizontal water heater with Front Heat Exchanger
HF2000
 
Our Price:
$399.99
502579
Water Heater 
Water Heater 
20 gallons, 240 Volt, 16" w x 32" d x 16"
Stainless Steel Horizontal water heater without heat exchanger
H2250E
 
Our Price:
$429.99
502554
Water Heater 
Water Heater 
11 Gallons, 120V, 1500W, 16"W x 22"D x 16"H
Without heat exchanger, stainless steel, horizontal
S1200E
 
Our Price:
$349.99
501253
Water Heater 
Water Heater 
20 Gallons, 240V, 1500W, 16"W x 32"D x 16"H
Without heat exchanger, painted aluminum, horizontal
H2050EW
 
Our Price:
$429.99

Ahhh, the luxury of plenty of hot water! Life is a lot easier on board a boat with a hot water system installed for showers, galleys, washing-up and general personal hygiene.

That little extra comfort of warm water, particularly on a cold and damp morning, increases the feeling of well-being for everyone onboard. Install a water heater and you'll always have plenty of hot water on tap, with no additional running costs for models equipped with heat exchangers, since all of the heat comes from the otherwise wasted engine cooling water!

Note: Models without heat exchangers use shore power or generators for electric heat generation. So, if you are planning to install a hot water heater that will use electric heat only, you need to take the increased electric load into account so you don't accidentally drain your batteries prematurely.

 
 
 
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