Heating assembly mounted in boilers, water heaters and storage tanks via a threaded socket and supplied with a thermostat.
Also known as: Screw plug heater · Screw-in immersion heater · Tank heater · Boiler heater
You can upload your technical drawing via the quote form.
General Information
Boiler and tank heaters are immersion heaters screwed directly into a threaded socket welded to the vessel wall. Compared with flanged assemblies, they are used for lower power ratings and applications requiring more economical installation: hot water cylinders, central heating boilers, storage tanks and small process vessels are typical uses.
The product is usually supplied with an adjustable thermostat and a safety thermostat. The control thermostat maintains the target temperature, while the safety thermostat cuts the circuit with manual reset in the event of overheating. This dual protection is the most effective safeguard against dry firing.
The sheath material is selected according to water quality. AISI 304 is sufficient for mains water; for applications with high chloride content or seawater, AISI 316 can be preferred, and for central heating circuits a copper sheath with higher thermal conductivity. A low watt density design is recommended to delay scale build-up.
Applications
- Hot water cylinders
- Central heating boilers
- Storage tanks
- Process vessels
- Washing tanks
Related Industries
Frequently Asked Questions
On request it is built with an adjustable thermostat and a safety thermostat. If you will use an external PID controller, a version without a thermostat can also be produced; the configuration is agreed at the quotation stage.
The safety thermostat is the first line of defence. In tanks that are frequently emptied, an interlock with a level switch is also recommended; this largely prevents failures caused by dry running.
Related Guides
Related Products
Let us define the right solution for your project together
Contact us to determine the most suitable heater and industrial heating solution for your project. Our technical team is ready to offer the solution that best fits your requirements.