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Hi, Please can anyone help! We recently purchased a 70ft narrowboat (2007) with a Barrus Shire 45 engine. We have 4 ways in which we should get hot water from the boat which are listed as follows: 1. From the engine when running. 2. Eberspacher diesel system. 3. Log Burner and back boiler. 4. Immersion Heater Problem 1 We are new to boating and have only just bought the boat which was built in 2007. The engine is a Barrus Shire 45 and the coolant system is plumbed to a twin calorifier at the centre of the boat. Circulation is aided by a pump in the engine bay. When the engine is running, the hot water in the calorifier does not get hot. The expansion tank in the engine bay is also staying cool. Problem 2 The Eberspacher and Log burner are linked on one header tank separate to the engine header tank. When the eberspacher is running we get hot radiators ( 4 in total) but no hot water. The header tank is located in a wardrobe at the back of the boat which gets hot but with this system does not boil over. Problem 3 If we light the log burner a pump which is located at the back of the burner starts pumping that is controlled by a heat temp switch I think its called which senses the pipe getting hot and sends a signal for the pump to work and a light illuminates to show this is working. However the header tank which is shared with the eberspacher system does not get hot and pressure builds forcing the liquid out the small outlet pipe of the top of the tank. We get no hot radiators or no hot water. The pump starts to make a loud noise and we have had to put out the fire. We purchased the boat from a Marina who was acting as a brokerage for the vendor. We also paid over £800.00 for a full survey and this was not discovered. The Marina have just charged us £640.00 to relocate the old header tank from its location in the well deck to the wardrobe in the back of the boat as they said it was too low and have also replaced a pressure release valve and refilled with antifreeze and bled the system. This has failed to resolve the problem and the marina are now wanting over £2000 to re-pipe the whole boat! Summary We can only get hot water from the immersion heater. Eberspacher heats radiators but again no hot water - expansion tank gets hot but doesn't overflow Log burner does not heat water or radiators and header tank stays cold and the coolant is forced from top of bottle Engine doe not heat water and header tank bottle stays cold - Marina have replaced a relay on the engine pump but this has failed to resolve the problem Urgent Concern I need to move the boat this weekend to its new mooring (7 hrs cruising) and from the reading I have been doing I am wondering if it is possible that it is one of the engine thermostats that has failed. Ours has 2 thermostats, one at 71 degrees and a second at 88 - IF it is a thermostat and i move the boat - is there a chance that the engine will overheat and seize??? How can i eliminate this being a problem before I move the boat or is it worth replacing them to be sure and safe? Any help greatly appreciated - boat must move on Friday! We have had some helpful suggestions from Tony Brooks with regards to the first part of the email but the urgent concern bit only came to mind last night and made me worry a bit - Thanks in advance Joanne