Honeywell ST6400C Programmer

You can change the original factory timings on the honeywell st6400c for water heating and central heating, but it doesn't make any difference. It shows the new settings, but turns the boiler on and off according to the original ones! Hopeless.

The Honeywell ST6400C programmer for central heating and hot water systems is excellent.

Offers a digital clock which keeps the time during power outages, less used buttons are hidden behind a flap. We have found it easy to program and use. Can use up to 3 on/off cycles per day and different setting for weekends.

We have been using for about 4 years without a problem, until I recently broke the flap at the hinge. I e-mailed Honeywell, they responded within 24 hours and the next day a new flap was delivered in the post free of charge. Now that is excellent service.

So if you are installing a new programmer on your boiler we can strongly recommend the Honeywell ST6400C - trawl the net for best price.