Which heat exchanger suits your engine?
Pick what needs cooling, enter the power, and the selector matches Bowman's published model ratings — jacket water, gearbox oil, hydraulics, charge air or exhaust heat recovery. The popular sizes are usually on the shelf in our Australian warehouse.
The engine cooling ladder at a glance
Bowman's published "suitable for engines up to" ratings — inline tubular units (remote header tank) and their header-tank equivalents share identical ratings.
| Engines up to | Inline tubular | Header tank version |
|---|---|---|
| 20 kW (27 hp) | EC80 | — |
| 40 kW (54 hp) | EC100 | EH100 |
| 52 kW (70 hp) | EC120 | EH200 |
| 82 kW (110 hp) | FC100 | FH100 |
| 115 kW (154 hp) | FC120 | FH200 |
| 150 kW (201 hp) | FG100 | FH300 |
| 200 kW (270 hp) | FG120 | FH400 |
| 240 kW (322 hp) | GL140 | GH200 |
| 320 kW (429 hp) | GL180 | GH300 |
| 400 kW (540 hp) | GL240 | GH400 |
| 450 kW (603 hp) | GK190 | KH200 |
| 600 kW (804 hp) | GK250 | KH300 * |
| 620 kW (831 hp) | JK190 | JH200 * |
| 750 kW (1005 hp) | GK320 | KH400 * |
| 820 kW (1100 hp) | JK250 | JH300 * |
| 1000 kW (1340 hp) | JK320 | JH400 * |
| 1200 kW (1608 hp) | PK250 | PH200 * |
| 1500 kW (2010 hp) | PK320 | PH300 |
| 1800 kW (2413 hp) | PK400 | PH400 |
| 2500 kW (≈3350 hp) | RK400 | — |
Ratings from the official Bowman brochures; marine (sea water) and land-based versions carry identical ratings. *Bowman's published figures for a few mid-range header-tank models vary between their website and brochures — we confirm these with Bowman before quoting. Engines beyond 2,500 kW move to bespoke Bowman engineering.
Selector FAQs
How does the selector pick a model?
It uses Bowman's own published method. For engine cooling, gearbox oil and charge air, every Bowman model carries a 'suitable for engines up to X kW' rating with the thermal assumptions built in — the selector matches your engine's rated power to that ladder. For hydraulic systems, coolers are rated by heat load, so the selector estimates heat as 25–30% of your installed hydraulic power (the published industry rule) and sizes on the upper figure, or uses your known heat load if you enter one.
What if my conditions aren't typical?
Bowman's ratings assume typical raw water temperatures and flows. Very warm tropical water, a derated or heavily-loaded engine, restricted water flow or unusual oil specifications all change the duty — that's when Bowman's computer-aided selection (CAS) earns its keep. Every selector result goes through Luxfords before purchase, and we run anything marginal through CAS with Bowman.
Should I size up?
Often, yes — and the selector shows the next size up for exactly that reason. Extra cooling surface costs comparatively little, runs the system cooler and slower-fouling, and buys margin for hot Australian summers and the day the tube stack is half-due for a clean. Engine makers' own guidance (Caterpillar's installation guides, for example) recommends sizing heat exchangers with roughly 10% margin over calculated heat rejection.
Do you only sell complete units?
No — tube stacks, end covers, O-rings and anodes are available separately for the popular sizes, and a worn unit can often be brought back with just a new stack. We also cross-reference failed units of other brands to the right Bowman or Savage equivalent.