What is the DELTA Electric Boiler and how does it work within a hybrid energy system?+
The DELTA Electric Boiler is a core component of the DELTA hybrid energy centre, designed to work alongside heat pumps to optimise energy efficiency. It functions by handling peak heating demand whilst the heat pump manages bulk demand, allowing you to minimise capital expenditure (CAPEX). The boiler features multiple heating elements that can be modulated down to single-stage operation, providing flexible support to meet your system's varying requirements. This approach ensures that you don't need to oversize your heat pump to cope with peak capacity demands.
What range of sizes are available, and how do I choose the right capacity for my system?+
The DELTA Electric Boiler is available in a comprehensive range of models spanning from 31 kW to 1400 kW, with options featuring 7-stage, 15-stage, or 30-stage configurations. The choice of capacity depends on your specific heating requirements and system design. With sizes available at incremental levels (such as 31, 42, 52, 63, 90, 99, 119 kW and beyond), you can select the exact amount of peak support needed to complement your heat pump without over-investing in unnecessary capacity. We recommend consulting the technical guides and datasheets for each model to determine the most suitable option for your installation.
What does "large modulation range" mean, and why is it important?+
A large modulation range refers to the boiler's ability to adjust its output across a wide spectrum of power levels, down to operating at a single heating stage. This flexibility is important because it allows the system to respond efficiently to varying heating demands throughout the day and across seasons. Rather than the boiler running at full capacity when only partial heating is needed, modulation ensures that energy is used efficiently at any load level, reducing energy waste and improving overall system performance and cost-effectiveness.
What is the maximum flow temperature, and what electrical specifications should I be aware of?+
The DELTA Electric Boiler provides a flow temperature of up to 95°C as standard, which is suitable for most heating applications. Regarding electrical specifications, the boilers operate on a 400V 3-phase supply, with 690V available on selected models for specific installations. The individual models vary in their power stages and electrical requirements—for example, the DELTA-EB31 operates at 4.5 kW per stage with a maximum current of 46A, whilst larger models have proportionally higher power stages and current ratings. Cable connections typically range from 35–95 mm² (copper or aluminium), and external control at 230V is available for system integration.
How does the DELTA Electric Boiler help reduce overall system costs?+
The DELTA Electric Boiler significantly reduces overall system costs by minimising CAPEX through strategic load sharing with the heat pump. Rather than sizing your heat pump to handle peak heating demands (which would be expensive and inefficient), you can install a smaller heat pump to manage bulk demand and add an appropriately sized electric boiler to handle peak loads. This approach also adds system resilience, as the boiler can compensate for any shortfalls in heat pump capacity or flow temperature requirements. The result is a more cost-effective, efficient hybrid system that balances capital investment with operational performance.
