Sounds like you want something seriously chunky, Skip!!!
Our old oil fired rayburn heats the whole 3 bedroom house when set on the lowest setting. No hassle with oil....till the war starts, that is!!!
There are lots of dealers about, and some will help you find second hand ones. Esse, Rayburn, Aga, and Windrush are the ones I know of.
Hope you find one soon, it can get pretty chilly on your side of Offa's Dyke this time of year!!
Cheers, Bron.