In many chemical, pharmaceutical and food plants, industrial reactors need to operate at around 70 °C using thermal jackets.
At the engineering stage, a key question arises: is it more efficient to install a hot water boiler that directly delivers water at 70 °C or to generate steam and use it to heat the reactor circuit?
The answer depends on the energy architecture, but when we talk about high-efficiency electric steam boilers, the analysis changes significantly.
Generation efficiency: electric steam vs. hot water
An industrial gas-fired hot water boiler can achieve efficiencies of 95-98% under optimal conditions.
However, an industrial electric steam boiler converts virtually all electrical energy into useful heat. The electrical-thermal conversion efficiency can be around 99%, since:
- No combustion losses.
- There are no exhaust gases.
- No chimney losses.
- No combustion air is required.
- There are no penalties for excess oxygen.
From an energy standpoint, electric steam eliminates the inefficiencies associated with conventional thermal systems.
When the electricity comes from renewable sources, moreover, the system becomes a direct solution for industrial decarbonization.
Does it make sense to produce steam and then obtain water at 70 °C?
At first glance, it might seem that producing steam (at a higher temperature) and then exchanging heat to obtain water at 70 °C introduces an additional step.
But in real industrial reactor heating applications, steam offers relevant technical advantages. For example, more efficient heat transfer. Steam transfers energy by condensation, releasing latent heat with very high exchange coefficients. This allows:
- More compact heat exchangers.
- Faster thermal response.
- Precise temperature control in process ramps.
- Greater stability in dynamic cycles.
In reactors with load variations, this dynamic capacity improves operating performance.
Auxiliary power consumption and pumping
A hot water circuit requires recirculation pumps sized for the required heat flow. In plants with multiple reactors, auxiliary power consumption can be significant.
In a steam-based system:
- Steam is distributed by pressure differential.
- The main fluid is not pumped.
- Only the feed water and condensate return are pumped.
In medium and large installations, this difference reduces auxiliary energy and improves the overall efficiency of the thermal system.
Electric steam and industrial energy architecture
The isolated comparison between “water at 70 °C” and “steam” can be misleading. The correct decision is made by analyzing the complete system.
Electric steam allows:
- Unify thermal services (SIP, cleaning, heat tracing, sterilization).
- Eliminate parallel systems.
- Simplify maintenance.
- Facilitate total electrification through Power-to-Heat.
- Reduce direct emissions at the plant.
- Easily integrated with renewable energy or photovoltaic self-consumption.
In plants where steam consumption already exists, opting for a high-efficiency (≈99%) electric steam boiler makes it possible to simultaneously cover all thermal demands with a single energy vector.
Which option is more efficient for heating reactors to 70 °C?
If we are talking about a small, isolated installation with no other thermal consumption, a hot water boiler can be a simple and efficient solution.
But in a real industrial environment, where there are multiple thermal demands and electrification strategies, the industrial electric steam boiler can offer:
- Higher generation efficiency.
- Less architectural complexity.
- Better dynamic response.
- Reduction of auxiliary consumption.
- Preparation for future decarbonization.
Efficiency does not depend only on the outlet temperature. It depends on the system design.
Conclusion: thermal efficiency and energy strategy
In the debate between steam vs. hot water for industrial reactors at 70 °C, it is not just a matter of comparing temperatures.
It is a matter of deciding:
- Which energy vector centralizes the plant.
- How the energy transition is structured.
- What level of overall efficiency is to be achieved.
- What role electrification will play in the coming years.
In this context, a high efficiency (99%) electric steam boiler is not only a viable alternative. It is a strategic tool for industry seeking energy efficiency, flexibility and real decarbonization.
Contact us and we will help you design the optimal solution for your installation.