My 32 year old Burstner has a split boiler tank. Truma. I imagine it would be difficult to find a compatible tank to replace. Ancient original tank/boiler. The guy I went to said I could buy a new one and have adaptions made to make it fit. Cost in the region of £1,000. Eeeek. The motorhome is worth about £5,000. I love it and would like to put hot water system right. Help! Any ideas please?