Fitting new boiler to old Elson tank

[eagleeye]

Can anyone tell me if its OK to connect a new heat only Vaillant to an old Elson tank. Not seen the job so not sure where the feed goes into the system. They currently have an old Apollo boiler working with it

 

[king of pipes]

Change the cylinder it's as old as the boiler do a proper job educate your customer it will be a mess in the elson and hotwater quality will be poor . Kop