When it comes down to:
Whom should I use for the installation of my desired heating system I should consider a few things.

Who was the first company or person to consult with your ideas of a dream home?
An Architect.
Who is the company or person who will build your dream home?
A Builder.
Whom do you pick for doing the plumbing?
A Plumber.
Whom do you pick for doing the sparky work?
An electrician.

Would you seek advice from a bricklayer on how to invest your savings?

Be careful, we have or had the leaky homes, do you want that the same happens with your heating system?

Pick a company with experience and knowledge and not just because you like the persons smile or the cheap price.

There is no room for errors with underfloor heating, it is set in concrete.

Content Management John Ruskin (1819 - 1900) There is hardly anything in the world that someone cannot make a little worse and sell a little cheaper, and the people who consider price alone are that person's lawful prey. It is unwise to pay too much, but it is also unwise to pay too little. When you pay too much, you lose a little money, that is all. When you pay too little, you sometimes lose everything because the thing you bought is incapable of doing the thing you bought it to do. The common law of business balance prohibits paying a little and getting a lot... It can't be done. If you deal with the lowest bidder it is well to add something for the risk you run. And if you do that you will have enough to pay for something better.