Webasto Marine Catalog 2025-2026 EN

Isotherm hot water boilers

Isotherm water heaters

Type

Order number Volume (l)

L x diameter D (mm)

Weight (kg)

Max. pressure

Valve

Immersion heater

The Isotherm water heaters deliver high water heating performances thanks to thick insulation and smart design. Indeed, the engine water heat exchanger as well as the electrical heat element are positioned in the lowest part of the tank where the water is coldest in order to ensure an equal heating of all the water in the tank. The water in- and outlets are especially designed to minimize the mixture of cold and hot water.

Standard safety without mixing valve

LK safety without mixing valve

LK safety with mixing valve

230 V 750 W

230 V 1200 W

230 V 2000 W

115 V 750 W

115 V 1200 W

Basic

602431B000003

24

470 x 395 12.5

7

n

Basic 24

603031B000003

30

535 x 395 13.5

7

n

Basic 30

Product specifications:  Large range from 15 liter to 75 liter  4 product lines: Basic, Slim, Square, Spa  Extra long, corrugated coils for high heat exchange efficiency  Special 6.0 or 7.0 bar safety valve; simple winter drain  Ultra-thick insulation for lowest temperature loss  Electrical plug and play  Immersion heating element especially designed to heat also the water at the bottom of the tank  Thermostat mixing valve standard on Basic and Slim; optional on Square and Spa  Immersion heating element optional available in 750; 1,200; 2,000 W; 2,000 W heating element is compatible on 230 V versions only

604031B000003

40

640 x 395 15.5

7

n

n n

Basic 40

Isotherm Double Coil boilers are the perfect option to be integrated into Webasto water heating systems. Select among three models: Basic 24 Double Coil, Basic 40 Double Coil or Basic 75 Double Coil.

605031B000003

50

760 x 395

17

7

n n n n

Basic 50

607531B000003

75 1,050 x 395 24.5

7

n n n n

Basic 75

Basic Double Coil

602431BD00003

24

470 x 395

13

7

n

Basic 24 Double Coil

604031BD00003

40

640 x 395

16

7

n

n n

Basic 40 Double Coil

607531BD00003

75 1,050 x 395

25

7

n n n n

Basic 75 Double Coil

Slim

601531S000003

15

520 x 295

9

7

n

Slim 15

IM602031S000003

20

645 x 295 10.5

7

n

n n

Slim 20

602531S000003

25

765 x 295

12

7

n n n n

Slim 25

Spa

6P1531SPA0100

15

450 x 310

7.5

6

n

SPA 15

6P1531SPA0003

15

450 x 310

8

6

n

SPA 15 LK MV

6P2031SPA0100

20

550 x 310

9

6

n

SPA 20

6P2031SPA0003

20

550 x 310

9.5

6

n

SPA 20 LK MV

6P2531SPA0100

25

650 x 310

10

6

n n n n

SPA 25

6P2531SPA0003

25

650 x 310 10.5

6

n n n n

SPA 25 LK MV

6P3031SPA0100

30

535 x 390

12

6

n

SPA 30

6P3031SPA0003

30

535 x 390

12

6

n

SPA 30 LK MV

6P4031SPA0100

40

640 x 390

14

6

n

n n

SPA 40

6P4031SPA0003

40

640 x 390

14

6

n

n n

SPA 40 LK MV

IM6P5031SPA0003

50

745 x 392 15.5

6

n n n n

SPA 50

IM6P6031SPA0003

60

850 x 392 17.6

6

n n n n

SPA 60

Square

Dimension L x H x W (mm)

IM601631QX00000A 16 400 x 180 x 560

15

5

n

Square 16 LK

IM601631QX00003 16 400 x 180 x 560 15.5

5

n

Square 16 LK MV

Standard

n Optional – Not available

38

39

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