1 Key Benefits of the X Range 

What does the twin open therm do ??

@@kevinschoales844 In OpenTherm the device talks to the controller. A two way conversation. The OpenTherm standard was initially designed for one input device, so only one conversation. So if you have a weather compensation sensor (a device) and room temperature sensor (a device) then only one could be used. For e.g., the OpenTherm in the boiler talks to the weather compensator temperature sensor modulating the burner, with _on-off_ for the room temperature control. Now with _this_ boiler the two can talk to the controller, with _both_ modulating the burner. OpenTherm is _open._ That is, you can use many companies devices, not just the proprietary devices of the manufacturer (which tend to be expensive).

Thanks for that John, we have installed Intergas since 2006 with weather compensation sensor, now use a Smart Wiser set up so existing installations can use both, didn't know that, thanks for advise.

Never had one loud ever ? Very strange 🤔

Look at the instructions first. You can have it heating only or DHW only. You will need to set the parameters.

@@johnburns4017 hw flow sensor issue. Now fixed

@@dzmalekvali1110 Simple job to diagnose and fix. Nice to know it is fixed. I _think_ this is the same flow switch used in a plethora of boilers, inc' Vaillant. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-m8E4L1DTdzU.html

Sounds like it was not fitted properly. Once fitted and set up you do not need to touch it.

Not the easiest for sure. But no different to many others.

Why are you not happy? One liners do not help.