One of the biggest luxuries of caravan life is confidently having hot water on demand whenever you want. Taking a shower, washing dishes, or simply cleaning your hands with warm water significantly boosts travel comfort. But choosing the right water heater shapes both your energy use and your experience in the long run. We’ve compared two popular tank-type heaters used worldwide and in Turkey — the Whale WH0802 (Rapid Heat 8 L) and the Truma B10 (10 L) — side by side on speed, energy use, capacity and especially winter behavior. Below you’ll find a summary table, use-case scenarios, practical tips and a quick decision test.
What’s the Difference in Brief?
- Whale WH0802: 8 L tank, gas + 230 V electric. Thanks to its dual-stage element (750 W or 1500 W), it adapts to low-amp campsites and also offers fast heating.
- Truma B10: 10 L tank, gas + 230/240 V electric. Its fixed 850 W element offers a low-draw advantage; however, the FrostControl drain valve’s frost protection emptying the tank in winter is the main thing users need to watch for.
Whale WH0802 — Pros / Cons
Pros: Very fast heating (gas+electric), 750 W (~3.25 A) / 1500 W (~6.5 A) flexibility, relatively low gas consumption (~93 g/hour), practical to use.
Cons: With 8 L, hot water volume per use is more limited; weight ~8 kg.
Truma B10 — Pros / Cons
Pros: A bigger tank at 10 L, safe use on low-amp sites thanks to a fixed 850 W draw (~3.7 A), a lightweight body (~6.5-6.9 kg).
Cons: In winter the FrostControl valve can trigger drainage around ~3-6 °C, emptying the tank; heating speed is slower than the Whale; gas consumption is ~120 g/hour.
Summary Comparison
| Topic | Whale WH0802 (8 L) | Truma B10 (10 L) |
|---|---|---|
| Tank Capacity | 8-8.5 L | 10 L |
| Electric Element | 750 W or 1500 W (user selectable) | 850 W (fixed) |
| Heating Times (15→70 °C) | Gas+AC: ~12-15 min • AC only: ~20-24 min • Gas only: ~26-33 min | Gas+AC: ~25 min • AC only: ~45 min • Gas only: ~34 min |
| Gas Consumption | ~93 g/hour | ~120 g/hour |
| Weight | ~8 kg | ~6.5-6.9 kg |
| Pressure Rating | Inlet max. ~1.9 bar | Pump max. ~2.8 bar • System max. ~4.5 bar |
| Winter Behavior | No automatic drain valve (winterizing still recommended) | FrostControl can auto-drain at low temperatures |
Winter Performance: What to Watch Out For
Truma B10 – FrostControl Drainage
In cold weather, the valve kicks in around 3-6 °C and can drain the water; it closes above 7 °C. This is frost protection, but it can momentarily cut off water access during winter camping. Solutions: heat/insulate the valve area, keep the caravan’s interior warm, and follow proper winterizing procedures.
Whale WH0802 – Winter Use
The manufacturer recommends standard winterizing/draining steps; no auto-drain complaints have been reported. The 750 W mode provides safe operation on low-amp sites in winter too; you can switch to 1500 W to speed things up if needed.
Source Note
The information in this section has been compiled from experiences shared by caravan users on forums such as motorhomefun.co.uk and outandaboutlive.co.uk, along with official Truma/Whale documentation. The situations described are based on user experience and may vary by conditions.
Which Use Case Fits Better?
- Quick shower and back-to-back use (camping/caravan): Whale WH0802
- Low-amp site + flexible electric use: Whale WH0802 (750 W mode)
- Larger hot water volume per use: Truma B10
- Winter camping (minimal hassle): Whale WH0802
- Winter camping (I’ll take precautions, manage FrostControl): Truma B10
Quick Decision Test
Answer the questions; see the recommendation below.
Summary: For four-season practicality, fast heating and electrical flexibility, the Whale WH0802 is the safer option. If you want more volume per use and a fixed low draw and are willing to manage FrostControl precautions in winter, you can consider the Truma B10.
Frequently Asked Questions
Is the Whale 750 W mode enough for low-amp sites?
Yes. With a draw of about 3.3 A, it runs safely on most 4-6 A limited lines. You can switch to 1500 W mode if needed.
Why does the Truma B10 drain water in winter?
The FrostControl frost protection automatically drains at low temperatures. This behavior is meant to prevent freeze damage; however, water access is temporarily interrupted.
What should I do to use the Truma trouble-free in winter?
It’s recommended to heat/insulate the valve area, keep the caravan’s interior warm, and follow winterizing procedures for long-term storage.
Which is better in terms of speed?
The Whale WH0802 is generally faster (gas+electric reaches target temperature in a short time). The Truma B10’s fixed 850 W element heats more slowly.
I want more hot water per use — which one?
With its 10 L tank, the Truma B10 is more suitable. For frequent use like back-to-back short showers/hand washing, the Whale can be more practical.
Source Note
The answers here have been compiled from manufacturer technical data and user experiences (e.g. motorhomefun.co.uk, outandaboutlive.co.uk). User comments are based on individual experience and may vary by conditions and installation.
