Tightening the 2 x screws underneath was very awkward too, although that was also true of the old unit. It can be used for combi boilers, heating zones or any application where small electric loads need switching. We're sorry but this product has now been discontinued by Honeywell Heating Supplies and can no longer be purchased. Equipped with advanced technology, the Honeywell ST9400A utilizes a two-channel control system, facilitating independent control of heating and hot water. Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH).

The heating and hot water programmes are completely independent to allow the system to be operated in the most energy efficient manner possible. The Honeywell ST9400A Twin Channel Programmer unit is a 1 day full programmer with two on/off switching times per day (which can be increased to 3). In the Winter the Central Heating is set to Once a day (the Heating being controlled by the room state) - early morning to late at night, the Hot Water remains on its Auto setting. Just one niggle, when the display is lit by a clear blue sky during the day the display shows dark patches.

Honeywell are the leading supplier of domestic heating and combustion controls in the UK, and are a Fortune 100 company employing over 127,000 people worldwide.

Energy Effi ciency and the Environment Home energy use is responsible for more than ¼ of the total UK carbon emissions which contribute to climate change. Today a leading supplier to aerospace, automation, control and transportation industries throughout the world, Honeywell’s origins were in the area of heating controls, a market which they still dominate today. The unit has independent controls to Override the time switch setting (turn On when Off or Off when On) and also Boost to just give 1 - 3 hours extra On time. Choosing the right Honeywell Home Electronic Programmer 24 Hour ST9400A1002, is an important decision, and it's one we're sure to help you get right. With its advanced features and durable construction, it offers homeowners precise control over their energy usage, enhancing comfort and convenience while minimizing wastage.The Honeywell ST6400A Programmer can be used for combi boilers, heating zones or any application where small electric loads need switching. This feature enables homeowners to effectively manage their energy consumption, reducing wastage and optimizing efficiency. Your Honeywell ST9400A provides timing control for both your central heating and hot water systems, letting you set ON and OFF periods to suit your own lifestyle.