Disaster looms for the budget

Despite 3 plumber visits, and his doing his best, the oil fired boiler is beyond effective repair. Somehow need to find a lump sum for a replacement in the Spring. Husband is thinking an outside boiler so that there is more space in the narrow back part of the house. Will stagger through the winter with the couple of programmes we can make work for hot water and manual control of the readiators . Will rely on the wood burner otherwise.  Lots of research needed on the boiler options find some advice!