It's relatively easy to weed out the snakes when you have people round to quote. Initially don't ask too many questions just observe their actions for example if I was to be installing a combination boiler in a property I would check the flow rate at 2 outlets 1 upstairs 1 downstairs this would give me an idea of restrictions on the pipework ie long runs with lots of bends and the size of boiler suitable for a property taking in to consideration the number of bathrooms etc (there is no point fitting a 40kw boiler in a 3 bed house with a flow rate of 10 litres a minute but yes I have seen it done!) equally in a 4 bed house with bathroom, ensuite and utility with 3 daughters and a flow rate of 18litres a minute it's a contender. Also I'd check the standing pressure. Next I'd be looking at gas supply meter capacity, pipe size and possible route for new pipe if needed. Then the condensate pipe and fluing options. This gives me a short list of possible suitable appliances.
now it's time to talk with customer, what are your behaviours habits and living demands like? What are your expectations from your new system and is there anything on your current system that isn't working or causing concerns from that I could select an appliance suitable for your needs
then i could inform you of its benefits over other similar options extended warranties, installer partnerships offering enhanced manufacturer support and what I can do as an installer to increase your boilers life. Full system flush, magnetic system filter, inline scale reducer, adding drain off valves where none are present (making future maintenance easier) increasing pipework size in parts to improve performance of heating/hot water where applicable.
ask your installer if they would be interested in carrying out the annual service? I gladly service all boilers installed by me. Why wouldn't I it's repeat business and it stops my customers using so done else.
its important to also say it's not just flushing the system and adding chemicals that signifies a good job done. It's also about your safety. The gas pipework needs to carry the correct amount of gas to supply that particular appliance. Long flue runs need to be clamped and be able to be inspected if they are to be boxed in. Pipework should be neat, thought out and supported.
Ask for pictures of previous work. Anyone that does a sterling job had at least one or two pictures of installs on there phones. Were egotistical heating engineers with a perverse sense of pride and self satisfaction with a job done well. We'd be glad to show off some nice shiny pipes with clips all in a row at he same level Andre catastrophe that was there before we started.
also how is there appearance jogging bottoms and rigger boots should send out alarm bells. How does the person quoting make you feel in your own home? Do you feel at ease have they taken time to answer any questions or suggest improvements if a pipe needs to be run on a surface have they discussed it's possible route ie close to the skirting board and not 4ft up the wall over your wall mounted plasma.
but expect to pay a sensible amount of money for a sterling service and quality products but above all peace of mind and a system that will perform safely and happily for many years
