ISOTEMP SPA marine water heater — engine + 230V (15 L to 60 L)
€485,95
incl. VAT 25.5%
Made in Bulgaria
ISOTEMP SPA series marine water heater — heat-exchanger boiler that uses engine coolant + 230V mains element for hot water. 7 capacities from 15 L (compact) to 60 L (family).
- Engine heat exchanger — water heats from engine cooling circuit while underway, FREE hot water
- 750W 230V element — heats from shore power at marina
- 6 bar max pressure — works with all standard marine pressure systems
- Stainless steel tank — corrosion-proof, decade lifespan
Capacity sizing: 15-20 L = weekenders (showers + dishes), 25-30 L = mid-size cruisers, 40-60 L = live-aboard / family. Bigger = longer hot showers but more tank space + heating time.
Select model
15 L (SPA15)
€485,95
20 L (SPA20)
€600,95
25 L (SPA25)
€574,00
30 L (SPA30)
€479,50
40 L (SPA40)
€690,95
50 L (SPA50)
€564,00
60 L (SPA60)
€742,95
In stock — ships within 1–2 business days
Free shipping on orders over 100€ · Free returns within 14 days
Use cases
Cruising hot water
Engine heat-exchanger means free hot water while motoring — combines with 230V element for marina nights when engine is off. Standard marine cruising water setup.
Live-aboard standard
40-60 L tanks support daily showers for 2-4 people without depleting in one morning. 750W mains element refills hot water in 30-45 min.
Replacement install
Replaces older Quick or generic marine boilers — same plumbing pattern. Pick capacity to match or upgrade from your old unit.
Specifications
| Capacity | 15 L |
| Dimensions | 450 × 310 mm (L × Ø) |
| Weight | 7.5 kg |
| Suits | Small cruiser, 1-2 person |
| Brand | Isotemp / Indel Webasto |
| Type | Marine water heater (heat-exchanger + 230V element) |
| Heating sources | Engine coolant (free, while underway) + 230V mains element (at marina) |
| Element power | 750W (all sizes) |
| Max pressure | 6 bar |
| Tank material | Stainless steel |
| Available sizes | 15, 20, 25, 30, 40, 50, 60 L |
| Made in | Italy |
Installation guide
1
Pick capacity by use
15-20 L for weekenders (one shower + dishes), 25-30 L for cruising couples, 40-60 L for live-aboard families. Bigger = longer hot showers but bigger install footprint.
2
Plan engine coolant connection
The boiler taps into engine coolant for free hot water while underway. Connect 16 mm hose to engine heat-exchanger or coolant bypass. Check engine manual for safe tap-in point.
3
Plumb the water side
Cold water in (3/8" NPT), hot water out (3/8" NPT), pressure relief valve (included). Add a check valve on cold inlet.
4
Wire the 230V element
Connect 230V mains element to shore-power circuit — usually a dedicated 3.5A breaker. Don't run element when tank is empty.
5
Test both heat sources
Engine: run engine 30 min, check hot water at tap. Mains: turn on at shore power, allow 30 min for full heat.
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