A boiler enquiry can also be a chance to review your wider plans. If you are considering solar or storage, ask for a proposal that explains each component and the way it will operate.
Separate price from projections
The equipment and installation price is different from estimated running costs. Ask what tariffs, usage and equipment performance are assumed in any forecast.
Ask about your property
Understand which assumptions relate to your home and which come from a general example. Roof orientation and shading matter for solar; battery capacity, usable output and charging arrangements should be explained in the specification.