![]() Thank you for the link to the Drayton stats. It seems a real shame that something that is meant to be so good doesn't appear to work in practise. ![]() I guess that the answer is that the stat cannot provide me (whether it is due to the non-condensing boiler or not) with the best solution for my house. I was puzzled that a supposedly energy efficient system was costing me more to run. When I change tact and boost the heating when needed to keep a similar temperature, it costs a lot less. I'm not a technophobe I promise! What frustrates me the most is that my boiler is constantly firing, yet the radiators never get hot. I've tried experimenting in detail with the settings to no avail. Interesting you should say that about the Honeywell stat. This prevents unnecessary boiler firing, etc, etc. I prefer the Drayton Mistat range, as their version of TPI (Chrono Proportional Control) can be switched off on their stats, to allow them to act like a normal stats. However, other manufacturers have stats with similar operation to TPI, but importantly, this can be turned off to allow the stat to work like a normal stat. ![]() I won't recommend Honeywell any more, as the TPI can't be turned off. TPI makes the boiler fire up for no reason and can sometimes fire the boiler every 4 mins. The TPI system is flawed, difficult to explain to customers, supposed to be more energy efficient but wastes it in other ways, creates unnecessary noise and wear and tear and can be annoying if the boiler is audible from rooms in house. Typical example of something that sounds clever, but in practice is impractical. THis is unlike normal stats that just monitor the actual temp and bring the boiler on and off to maintain the set temp. Your Honeywell stat's not sensitive, it just uses dodgy TPI operation to turn the boiler on and off according to the amount of time that it thinks your boiler needs to maintain the set temp.
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