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  1. This makes sense. Seems to be quite a lot of water lost though, the diesel heater runs about 90 minutes a day. I think this is the second time I have added 3/4 liters of water since the heater was installed. Rads bled also - a big air lock working its way out slowly? Lets hope!
  2. Returning to this topic. Just put another 4 litres of coolant into the system so there is definitely a leak. Have looked at all the pipes I can find and there is no visible leak. There is no water in the bilge. In the summer before the diesel heater was on, the level in the header tank stayed constant. Any ideas where else to look?
  3. SO..... when the system heats up the water level raises in the expansion tank. When it cools, it lowers. Is this air getting in, or water getting out or both!
  4. I think gravity system with added pump is best way to describe this system. As gravity still plays its part in keeping pressure in the system.
  5. Oh interesting. I did wonder about the this. The original gravity system did have a thermostat and a circulating pump on it, so just assumed that a Diesel pumped system would bolt on. Yes there is an overflow, but that is at the top of the header tank. Once the level drops below that then I do not know how any liquid will dissipate.
  6. So, the engine has a skin tank cooling system which is separate to the heating system. BUT the engine is connected to the Calorifyer so when you run the engine you get hot water. The heating loop with Diesel heater is also connected to the Calorifyer but I think it is a separate system. I have never noticed radiators warming up whilst the engine is running, just hot water. I know that is known as a gravity fed system, so there is an open header tank (completely separate to the engine header tank) above the heigh of the radiators giving some pressure to the system. Thinking back to the summer, the coolant level in remained the same so I am right in thinking this leaks when its heated. Would this be escaping as steam or will there be some water pooling somewhere? Good point, I will bleed the whole system tonight and then monitor from there onwards. I have bled this a lot before, would that indicate water being pushed out during heating cycle and then air being sucked back in during cooling? Thanks
  7. First winter aboard this boat and initially the central heating (three rads, towel rail and calarofier) were fed by a gravity system into a stove back boiler with thermostat. As this was noisy, inefficient we decided to remove the back boiler and fit a diesel heater. We had coolant loss from the system quite a bit but I attributed that to getting the stove too hot to quick, happened quite regularly, could hear the water boiling in the pipes. Now the stove has gone, the diesel heater installed and I have just checked the header tank again. It was empty. Have refilled with four jugs of pre mixed coolant, I guess about six liters. Have spent the whole day looking for a leak but everything looks dry. There is a hole at the back of the boat, under the floor where you can see/feel the bottom of the bilge and that is also dry. - this boat was built in 2011, I would assume any leak would arrive at the rear of the boat at the lowest point on the bilge? We list to the rear, especially with an empty water tank so I any leaks would collect back here. - Would a leak of this size be obvious? I have checked around all the radiators and joins in the pipes which I can see. Around the heating pumps and calorifyer. - how else can I go about finding this leak, I am sure that losing six litres is definitely a leak? Thanks
  8. Ha, good point no. The surveyor is a well known local one, who has been recommended to me as a surveyor before encountering this boat.
  9. Thanks for your frank response, this is exactly what I was looking for. Yes 4.2mm is WL. The price slightly reflects condition but needs to have at least 10k off it to make me interested. The survey was conducted by the owner prior to sale.
  10. Just to note, if I proceed with this boat I will get my own survey. Regardless of this, the boat in question has had a survey a few months ago commissioned by the current owner. In that survey the following was reported. "Widespread galvanic corrosion to hull sides with pitting up to 2.4mm deep." The original hull thickness in 2004 was 6/6/10, currently it has corroded to 4.2/5.6/9.8 at the worst points. There is also a note in the survey that all pits which exceeded 1.5mm had been pad welded and a galvanic isolator had been fitted. In the conclusion there is a note that says further pad welding may be required in areas behind protective coatings. Looks like this hull has not been cared for by the previous owner(s) but how bad in the grand scheme of things is this? What is the cost of future pad welding? How much will the issues found on this survey impact future resale? Thanks!
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