A couple of companies like boxt did it in the UK with gas boilers. The appeal is a fixed price quote online, next day installation by a qualified plumber and not having to spin the roulette wheel of trying to call plumbers, negotiate a "fair" price and not have the customer support if things go wrong.

Can you get a cheaper install with another plumber? Not necessarily! boxt have massive volume discounts with boiler manufacturers and presumably keep the installation charge reasonable but the plumber gets steady work and doesn't have to manage their client list so it does work pretty well.