The Glow Worm boiler has been in the industry for over 70 years, keeping British homes warm through its exceptional reliability, ease of installation, simple use environmental friendly and utility savings. There are many different models of the Glow Worm, all providing many of the same key features. The Ultracom hxi is used mostly to replace open vent boilers. The Ultracom hxi uses fourth generation technology with tested components of reliability and efficiency. This unit also has a stylish orange backlit digital programmer. This enables the user to set a seven day program that can be adapted to his or her lifestyle. If the user is going to be away for a period of time, the unit can be set to remain off until the day of their arrival, allowing them to come home to a nice warm environment.

More key features add to the appeal of the Ultracom hxi Glow worm boiler unit. There is a stainless steel heat exchanger which provides excellent reliability that is not found in other brands. This unit also gets the highest SEDBUK rating for boiler units sold in the UK, an A. The unit is protected against harsh winter months with the two-stage frost protection and anti-seizure controls feature. There is a range of models for the Ultracom hxi: 12kW, 15kW, 18kW, 24kW, 30kW and 38kW.

Another Glow Worm boiler unit has a similar name with the same level of efficiency. The Ultracom cxi also uses fourth generation technology to provide advanced comfort for homes. The Ultracom cxi costs approximately £692.58, and has the recommendations of the Energy Saving Trust. The nitrogen oxide rating class is five, and the unit also has an eco setting to provide additional energy savings while preserving the environment. The Ultracom cxi is most suitable for LPG applications, and does not require a conversion kit for installation. This unit also has a backlit digital control panel that has a 24 hour, seven day a week program.

Another choice for a Glow Worm boiler is the Flexicom 18sx, a system boiler that provides heating along with powered hot water that can be stored in a cylinder. The cylinder is part of a sealed system that does not require an expansion tank to be operable. The Flexicom 18sx costs £537.79, and has many simplified installation features. Ultimately, the choice of this type of boiler will depend on individual needs, and the size of the home.