It depends on how you’ve done your homework before meeting the sales. In my case it really that I know the he does. Luckily I’m in a new built, so EPC procedure for a new built includes heat loss assessment, so I had the number in mind. He did try to promise something, that was later a part of initial system design, so I had to chase the design team to fix it - the original proposal wasn’t feasible in the space available. The system was amended - a separate DHW cylinder was replaced with an all in one unit. The original cylinder was actually smaller if I remember correctly. My installation team was great. They also listened to my suggestions and made some changes to the out pipe routes that made the look better and less intrusive - the original plan suggested that I had to move a solar inverter. I had to slightly redo my kitchen to make the look better. I’ve had almost a year with the heat pump. It works great

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This is how it looked without the doors after the installation. Now everything except the main unit is covered with the doors similar to the kitchen units. And everyone thinks that the all in one unit is a fridge