Non condensing boiler condensing?

If it doesnt condense you wont have a high efficency boiler, 55 is good, above 59 and efficency of the boiler will drop alot. What is your opinion on when it should condense, it should always condense. You are lucky you dont have small radiators and need 82 when its real cold out, but where I am it goes to -30.

Shouldn't be: these boilers are deliberately designed with much less efficient heat exchangers than condensing boilers so that they don't condense under such conditions.

They can do if the rads are too large and the boiler stat is set too low. Keep it set to 75C minimum.

Thanks for that, the problem is there is no room stat, the proposal is to fit a room stat and run the boiler at 82 degrees 24/7, my Granny likes the heating on all day and we will probably set it at around 18 degrees at night(not the flow temperature).

Does this seem like a sensible approach?

Yes, about all you can do really.

Granny would be better off with a modulating condensing boiler; the flow temperature could be turned down as low as possible whilst still maintaining the inside temperature. The gas savings would probably pay for it within 2 -3 years.

Yes, a condensing boiler would do very well on this system only requiring a maximum flow temperature of 55 degrees. We do not really plan to change it just yet; we have just moved in and the boiler works perfectly.