How can I make my cat happy again?

My cat is really depressed because we got rid of his favourite sleep spot. Our boiler was super old but my cat loved it because we let him lie on it and it was really warm. It broke and so we ripped it out and got a new one but in a cupboard upstairs (which unsurprisingly he can't lie on) and now whenever he comes in he goes over to the big gap and looks at it all depressed. He wanders around the house meowing and moping and sleeping. He seems really unhappy and I don't know what to do because obviously we can't get the boiler back again!