Hot Water High Pressure Cleaners | Kränzle South Africa

Electrically heated or diesel burner

Two methods are supplied and they suit different sites. An electrically heated machine – the locally built Kränzle Electra range – heats the water through elements, so there is no burner exhaust. It is used indoors, in hygiene-sensitive areas such as food and beverage plants, and underground where combustion emissions are unsuitable. Outlet temperature is a function of heating output against water flow, so the same 48 kW machine runs hotter at 13 L/min than at 19 L/min. A diesel burner machine – the Kränzle Therm range – heats through a coil to an approximately 80 °C thermostat setpoint, which is held regardless of flow. Because the burner does the heating, the machine draws electrical power only for its pump motor – 2.4 kW on the 230V Therm 715 Black, 4 kW on the 400V Therm 1017 – not the heavy supply an electrically heated machine needs.

Heat does the work chemical would otherwise do

Heat dissolves oils and fats. Removing oily soiling with hot water first, and then applying chemical, means the chemical is used sparingly and effectively rather than doing the whole job – with less environmental effect on the water going down the drain. In the absence of hot water, the same result requires chemical to break the soiling on its own.

How the machines are built

The Kränzle Electra range is manufactured at our Cape Town facility in a stainless steel cabinet, mobile or wall mounted. Every configuration carries a reservoir tank with a low level cut-out, current overload protection, shock-absorbing buffers, dry-run safety and Total-Stop with delayed motor cut-out. The pump is a genuine Kränzle unit with a forged brass pump head and ceramic-coated stainless steel pistons, running at 1,400 r.p.m. Supplied with a 10 m double braided high pressure hose, Starlet gun and stainless lance. Hose drum, Turbokiller and chemical injector are optional.

The quality of the components in the pump head, as well as the safety features that protect the pump, is what determines how long a machine lasts. It is on this that Kränzle guarantees users the highest quality, superior cleaning power and a particularly long service life.

Kränzle Electra configurations

400V

Heating	Amps	Flow	Pressure	Outlet temp
24 kW	40 A	10 L/min	180 bar	52.4 °C
24 kW	40 A	13 L/min	200 bar	44.5 °C
36 kW	60 A	10 L/min	200 bar	69.6 °C
48 kW	80 A	13 L/min	200 bar	70.9 °C
48 kW	80 A	16 L/min	180 bar	61.0 °C
48 kW	80 A	19 L/min	160 bar	54.2 °C
72 kW	120 A	13 L/min	200 bar	97.4 °C
72 kW	120 A	16 L/min	180 bar	82.5 °C
72 kW	120 A	19 L/min	160 bar	72.3 °C
96 kW	160 A	16 L/min	180 bar	104.0 °C
96 kW	160 A	19 L/min	160 bar	90.4 °C

Outlet temperatures are calculated at an 18 °C inlet. The machine adds a fixed temperature rise, so a warmer supply raises the outlet by the same amount – a 96 kW machine at 16 L/min adds 86 °C whatever the water comes in at. Actual outlet also depends on supply voltage. 36 kW, 96 kW and all 525V builds are wall mount only. The pump motor runs at 1,400 r.p.m.

525V – mining, wall mount only

48 kW at 13 L/min / 200 bar, 16 L/min / 180 bar or 19 L/min / 160 bar. 525V is used mainly underground and is not a standard supply – the motor is specially wound for it, so it is a special-order build with an extended lead time. Never quoted off the shelf.

Kränzle Therm – diesel burner

Model	Flow	Pressure	Supply	Pump motor	Outlet temp
Kränzle Therm 715 Black	11.91 L/min	30–130 bar	230V	2.4 kW	80 °C
Kränzle Therm 1017	16.66 L/min	30–150 bar	400V	4 kW	80 °C

Both supplied with a 10 m hose, Starlet gun, lance and chemical injector, and both available in a stainless steel version at additional cost. The Therm 715 Black is converted locally to single-phase using a K 2160 pump; the Therm 1017 is imported three-phase.

Frequently asked questions

When is a hot water high pressure cleaner worth specifying over cold water?

Where the soiling is oily or greasy. Heat dissolves oils, so hot water removes the majority of that soiling before any chemical is applied. The chemical is then used sparingly and effectively rather than doing the whole job, with less environmental effect on the water going down the drain. On soiling that is not oil-based, cold water at the correct pressure and flow does the same work.

What is the difference between an electrically heated and a diesel burner machine?

An electrically heated machine, the Kränzle Electra range, heats through elements and produces no burner exhaust, so it can be used indoors, in hygiene-sensitive areas and underground. A diesel burner machine, the Kränzle Therm range, heats through a coil, so it draws electrical power only for its pump motor (2.4 to 4 kW), not for heating. The practical divider is the electrical supply available – a 96 kW Electra draws 160 A.

How hot does the water actually get?

Between 60 °C and 120 °C across the range in practice. On the Kränzle Electra machines the outlet temperature is a function of heating output against water flow and inlet temperature, so a 48 kW machine calculates to 70.9 °C at 13 L/min and 54.2 °C at 19 L/min from an 18 °C inlet, and a warmer supply raises both. The Kränzle Therm diesel burner machines hold an approximately 80 °C thermostat setpoint regardless of flow.

What heating outputs are available?

24 kW, 36 kW, 48 kW, 72 kW and 96 kW on the Kränzle Electra range, drawing 40 A to 160 A on a 400V supply. 36 kW, 96 kW and all 525V builds are wall mount only.

Are hot water machines available for underground mining?

Yes, on a 525V supply at 48 kW, wall mount only. 525V is used mainly underground and is not a standard supply, so the motor must be specially wound for it. This adds cost and extends the lead time, and a 525V machine is never quoted off the shelf.

Mobile or wall mounted?

Both. The Kränzle Electra range is built at our Cape Town facility in a stainless steel cabinet, supplied mobile or wall mounted, other than the 36 kW, 96 kW and 525V configurations which are wall mount only.