Sleipner SE40 Tunnel Thruster 12V
#1 in Under 45 kgfFull review
A strong value pick for a 26 to 34 ft boat: about $36 per kgf from a compact unit. Check that your battery bank can feed 315 A.
Amazon $1,450$1,450
The Sleipner SE40 Tunnel Thruster 12V is the better bow thruster overall, rated 3.6 to 3.4. The Sleipner SE40 Tunnel Thruster 12V leads on value and weight. The Lewmar 110TT Tunnel Thruster Kit costs $107.12 less ($1,342.88 vs $1,450).
Prices were last checked November 4, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Lewmar 110TT Tunnel Thruster Kit
#5 in Under 45 kgfFull review
A kit for a small boat up to about 28 ft that wants everything in one box. Sleipner SE30 gives more thrust for about the same money.
Amazon $1,342.88$1,342.88
Which should you buy?
- Choose the Sleipner SE40 Tunnel Thruster 12V for value ($36.25 per kgf ($1,450, 40 kgf) vs $47.96 per kgf ($1,342.88, 28 kgf)) and weight (4 kgf per kg (40 kgf, 10 kg) vs 2.8 kgf per kg (28 kgf, 10 kg)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every under 45 kgf bow thruster; a clear win is highlighted. How we rank explains each one.
| Factor weight | Sleipner SE40 Tunnel Thruster 12V | Lewmar 110TT Tunnel Thruster Kit |
|---|---|---|
| Overall rating | 3.6/5 | 3.4/5 |
| Value 40% | 75 $36.25 per kgf ($1,450, 40 kgf) | 56 $47.96 per kgf ($1,342.88, 28 kgf) |
| Efficiency 25% | 60 18.2 kgf per kW (40 kgf, 2.2 kW) | 67 18.7 kgf per kW (28 kgf, 1.5 kW) |
| Run time 25% | 33 3 minutes continuous | 50 run time not published (neutral score used) |
| Weight 10% | 67 4 kgf per kg (40 kgf, 10 kg) | 27 2.8 kgf per kg (28 kgf, 10 kg) |
Specifications
| Sleipner SE40 Tunnel Thruster 12V | Lewmar 110TT Tunnel Thruster Kit | |
|---|---|---|
| Thrust | ||
| Rated thrust | 40 kgf | 28 kgf |
| Thrust at full supply voltage | 48 kgf | - |
| Style | Tunnel | Tunnel |
| Propellers | Single | Single |
| Bow or stern use | Yes | - |
| Boat length | 26-34 ft | Up to 28 ft |
| Electrical | ||
| Supply | 12 V | 12 V |
| Motor | 2.2 kW | 1.5 kW |
| Current draw | 315 A | - |
| Continuous run | 3 min | - |
| Build | ||
| Tunnel diameter | 125 mm | 110 mm |
| Weight | 10 kg (22.1 lb) | 10 kg (22 lb) |