Replacing our old Stove required us to purchase a stove that complies with the new Defra & Clean air rules .... Unfortunately, we were unaware that this means that we will no longer be able to burn overnight, important to us as the stove is our only form of heating. Anyhow, back to the Crystal 12. Its a hefty solid piece of kit, we are still at the phase of tempering the stove by slowly increasing the burns .... At present the only comments I can make are that the controls for adjusting the burn rates are nowhere near as responsive as the old and cheap stove that we replaced. Adjusting the secondary & tertiary air controls seems to have very little range, it is almost acting as an on/off switch, you get either all or nothing. Admittedly, I'm still settling the stove in and as per instructions, only burning wood whilst I temper the stove metal. I am hoping that burning ovoids will show an improvement.