What is Flow Through Heating?

Flow-through heating is a method of heating water quickly as it flows over the heating element.
Ferro Flow Through Heaters can produce instant hot water and steam, suitable for domestic and professional coffee machines.

A+++ Energy rating
With no standby time and low energy wastage.

Instant Steam
To create the perfect beverage.

No Storage Tank
Less energy wasted keeping unused water hot.

Instant Heating
Hot water and steam is ready in seconds.

Precise Temperature Control
With built in NTC.

Compact Design
Great for small appliances like kettles or coffee machines.

Standard Components

FTH II Logo

  • A+++ energy efficiency – maximum performance with minimal energy use
  • Delivers ultra-fast, high-pressure heating for instant hot water and steam
  • Precision control for consistent beverage quality every time
  • Rapid heat-up and cool-down with Ferro Techniek’s patented technology
  • Built-in triple safety system: thermal fuse, NTC, and Ferro E-FAST
  • Compact, integration-ready design for modern appliances
  • Low scale formation and easy descaling for long-lasting reliability

FTH IV Logo

  • A+++ energy efficiency – instant heating with minimal energy use
  • Heats water up to 97°C in seconds for perfect extraction temperature
  • Designed for high-pressure systems up to 20 Bar
  • Consistent flow rate of 7 ml/s with exceptional precision
  • Built for reliability – tested to a 40 Bar burst pressure
  • Ideal for portioned beverage appliances demanding speed and control

FTH XL Logo

  • A+++ energy efficiency – powerful performance with minimal energy use
  • High-power 3400W design ideal for professional coffee and cooking machines
  • Large flow channels for high throughput and low back pressure
  • Delivers temperature-accurate hot water and steam instantly
  • Maintains a steady 11 ml/s flow rate for consistent performance

Max Power Flow Rate @ 95°C Dimensions Steam
Function
FTH II 2.3kW 7 ml/s 90mm YES
FTH IV 1.5kW 5 ml/s 84 x 84mm NO
FTH XL 3.4kW 11ml/s 110mm NO

FTH construction includes:
Max operating pressure 20Bar
NTC water sensing & thermal safety protection

Construction Overview

Construction Overview

Our Flow Through Heaters combine a Thick Film element with a channel plate to circulate liquid over the element surface.
This robust construction allows for high pressures. An NTC at the water outlet measures the temperature, and is used to control the power or the pump.

Channel Plate

The channel plate is joined to the steel element substrate, which gives it strength  to cope with high pressure (maximum 20 bar operating, min 40 bar burst).
The stainless steel construction meets food safety standards.

Temperature Sensing

Our standard Flow Through Heaters incorporate E-FAST technology for overheat protection, and an outlet NTC for temperature sensing & control.
The NTC is passed through the channel plate to directly measure the temperature of the liquid.

Steam Capable

High pressure construction combined with E-FAST allows for our Flow Through Heaters to also produce steam, even super heated.

Environmental and Efficiency Benefits

Overview

Our Flow Through Heaters offer significant environmental and efficiency benefits, drawing from the core attributes of Thick Film Technology.
By reducing element mass, and eliminating standby operation, wasted energy is cut to an absolute minimum. In addition, the entire lifecycle of the product, including its manufacture, is more environmentally friendly than competing options.

No standby

With the flow through heater, there is no waiting for the heater to warm up or necessity to keep the heater hot in “standby mode”.  There is no need to have a boiler full of hot water.  The flow through heater instantaneously heats just the water that is required, giving significant saving energy and makes the appliance highly efficient/green.

Total Life Impact

TNO an independent Dutch organisation compared the environmental impact of a FTH vs the theoretical minimum, a boiler and a thermal block.  They did this from cradle to grave including service life of making 10K cups of hot water.

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