Comparing Power Flush quotes

What type of power flush equipment do they use, do they use a proper power flush machine with a separate magnetic filter to pick up on sludge?

Are they members of the Power Flush Association?

Do they use the best chemicals? not cheap unbranded ones?

Are they experienced in carrying out a power flush? hold all relevant Gas Safe accreditation and have public liability insurance.

Will they lay dust sheets and protect floor coverings?

Do they know the correct place to connect on to your central heating system to ensure the best flush?

Is a completion certificate left at the end of the power flush, you will need this if you have insurance on your heating system?