Save up to % by comparing quotes from our suppliers! Check if we have engineers in your area…. Strysen heating are turning this year! we’d like to thank all of our customers and staff over the years for their continued support. We can’t fault the quality of the job your guy left, and he was very tidy also, tell him well done! To know the exact pressure your boiler needs, you’ll need to refer to your owner’s manual. If.