Duct Heaters

Frequently asked questions

What is a duct heater used for?

A duct heater warms the air moving through a supply duct. Typical uses are tempering fresh air in offices, workshops and commercial buildings, preheating the supply air on ventilation and MVHR systems, and keeping the supply air comfortable in cold weather.

What size duct heater do I need?

Match the heater to the duct diameter, from 100mm to 315mm, then choose the output. The output you need depends on the airflow and how much you want to raise the air temperature. As a guide, raising 100 m³/h of air by 10°C takes about 0.34kW.

Is there a minimum airflow?

Yes. Every electric duct heater needs a minimum airflow over the element to stay safe, from 70 m³/h on the 125mm kit up to 415 m³/h on the 315mm kit. The figure is on each product page. The fan must run whenever the heater is on.

What comes in the CBMT/Q kit?

The kit includes the CBMT duct heater with integrated control, a TG-R430 room sensor and a TG-K330 duct sensor. The heater controls to the temperature set, using the room or duct sensor.

What power supply do they need?

All the kits we stock run on 230V single phase. The 5.4kW models draw up to around 30A, so they need a suitably rated supply. Installation must be carried out by a qualified electrician.

Do you supply three phase or larger duct heaters?

Yes, we can source three phase, higher output and rectangular duct heaters to order. Send us the duct size, airflow and temperature rise: email hello@efans.co.uk or call 0161 399 3825.