I'm looking to upgrade my old appollo 15/30b boiler to a new one. I have 2 quotes so far but i am unsure about them.
I have a 3 bed semi detached house, with 9 radiatiors.
one quote for £2136 is for a vaillant ecotec pro condensing combi boiler (will this be sufficent for my property, does not state if its a 24 or a 2 also is this a reasonable price condisdering relocation of boiler, 8 thermostatic valves, boiler and all works req.)
and another quote for £2740 for same works but this is with a Baxi Duo-tech HE33 condensing Boiler.
The second one seams to be the more powerful but would the first be sufficent for central heating and deliver a good hot water supply?
Both decent boilers, the vaillant will be abit more expensive but vaillant's tend to run forever.
To know which one will give the better flow rate for the hot water you will have to find out the exact model of the Vaillant and compare it to the Baxi.
The Pro range only comes in 2 models - 24 (9.4l/m) or a 28 (11.5l/m). Therefore the Baxi will be give the better flow rate (13.5l/m).
But if you wanted a vaillant, you could get one with a better flow rate.
The price for the Vaillant seems fair. There's not much difference in the boiler prices. And Vaillant's normally cost more. So the guy that gave the quote for the Baxi, could do it for the price the guy gave you for the Vaillant.
But get a few more. Quotes don't cost anything. So why only get 1 or 2.
Black water doesn't necessarily mean you need a powerflush. The water will be black in every system that has not been drained for years and has not had inhibitors added everytime the system is drained.
You could add system cleanser to the system now and leave for a few weeks (follow instructions on bottle) this will help remove the dirt that is stuck on the inside of the radiators, pipes and boiler. Drain and flush a few times hot and cold. Then renew the boiler and drain a flush a few more times to remove flux and copper filings. The key to preserving this condition is the addition of inhibitors, and replenishing everytime the system is drain.
If you've had problems or upon removing radiators there's a build up of sludge then yes a powerflush may be beneficial - otherwise an unnecessary expense.
Have the other installers said they would powerflush the system in with the price ? I doubt it.
The more quotes you get, you will see which is a common price and who overcharges.
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