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I do have a water softener, but Ive heard mixed reviews about if this actually does dissolve scale. If I could afford, I would buy new, but alas I have to make do with this! Thanks

Correct, its scale from inside the cylinder, around the coil / pipes of the cylinder. Yes its second hand.

Hi, Im trying to clean out a indirect clyinder before getting it installed. The scale is built up around the indirect pipes making it impossible to physically remove. I think chemical is the only way.I managed to chip a little off as seen in attachment picture. Ive tried Fernox DS3 but it...

Other brands, i.e. not honeywell.

Sorry Dan I should have explained, the megaflow has its only thermostat does't it? Question then, if honeywell products don't support megaflow cylinders because they rely on their own cylinder stats, how do other controllers make the communication with the megaflow unit?

Dan, do you have any experience with megaflow unit. I was wondering if they could operate without a controller, as they do when you use the electrical element. The internal stat can call for the boiler so is it actually possible to wire so its on constantly?

No, I was referring to the ebay seller, not honeywell. Your exacty right thu, I have just been off the phone to honeywell and they are expressing out a new controller to me, very helpful. I guess thats what you pay for in big bands that delivery great service, thanks for your help all. Cheers

The units are next to each other, so its not a distance issue. Thanks, i didn't think honeywell dealt with public only installers, and I purchased it from a ebay seller, new but don't think they will provide any after sales service! ha, thanks

Hi, at the best time of the year, I discover that my honeywell st9420c has lost its wireless connection with the room stat and now will not 'bind' with the unit. Following the instructions both units correctly go into the binding mode but it never compleates successfully! Anyone with know or...