I have no hot water coming from my pessurised(?) system. I have cold water at full pressure at every outlet in the house. I have been told it is probably a frozen pipe in the wall and that we need to 'break into walls' to sort it out. If I am willing to live without hot water until the weather turns, is it likely to cure itself? If so, how do I recharge the pressure in the system (assuming I need to do this manually) once I have mains supply back?