New heater for our dog social center

Our heating system in the Hunde SOS (social station) is aging, breaks down partially and loses hot heating water in some places - and this in the place where the dogs spend the most time. It is urgently necessary to purchase new heaters, so that our fosters can again find a warm room in this station, when it is uncomfortable, wet and bitterly cold outside, especially now in winter.
In total there are 7 heaters that need to be replaced. Please help us to continue to give our dogs a warm and above all safe temporary home. We appreciate any support!