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It depends on the boiler, I don't think its all about replacing consumable parts but to ensure its working properly. The year after i had the new boiler installed i had it serviced and the plumber was here an hour but then it only cost around £30.
I'm guessing if your boiler is 20 years old it isn't the most economical. Does your house insurance require the boiler to be regularly serviced?
The guy came here to investigate the noise he was here for 2 hours maybe 3 the first time and then another 2-3 for the service so £60 I thought was a good deal for his expertise and time.
As for working correctly. Most modern boilers don't really have anything that goes wrong and they will continue to work.
If something breaks it usually means it will stop working maybe not completely but you will be able to tell. It needs some work on it.
I've replaced the pump 2 years ago and the diverter valve. The control board was the main weak point on this boiler and that was replaced with a nest smart system 4 years ago. It was on it's last knees and to replace with oem parts would be more than nest and they would fail again.
Nothing needs to be touched boiler wise. The pilot light is a smart system where it is electric and therefore never needs to be replaced or cleaned unless it breaks.
The gas engineer mentioned something about my pipes being smaller than newer ones so I'd need to replace all the pipes or stick with the smaller inlet when the boiler eventually dies.
He said he was surprised the boiler was still working but he was a young boy so he's used to working with modern boilers and he said they usually last 8 years in his experience. Unless you buy top end then you might get 10-15 out of one.
He honestly didn't check anything as there is nothing to check bar for pressure leaks.
The boiler has a light on it which will flash if something is wrong, etc.
Once this dies ill probably need to get the replacement serviced to keep the warranty in check. But after the initial warranty period I'll probably leave it 5 years between services and that's so they can clean it. Tbh nothing should be getting in there it's just parts of the heat shield that have worn and cracked over time. It's a case within a case. Very little needs done to them.
You are better off taking the service money and putting it in a tin towards your next boiler.
A decent boiler can be had for £800-£1500.
£50 times 20 years is £1000.
Servicing is pretty much not required unless you have a problem.
Take the pump for instance. I'd rather it die so it can be replaced with a more Eco friendly version which consumes less electricity therefore paying for itself.
My old boiler it's probably better off with the same now. No point in service or repairs unless small as I can get a new more economical boiler which will pay for itself with the savings.
It's better to run them into the ground then replace them and spend as little as you can keeping them going.
Labour is what the biggest bill is. Not the actual system.
Ill probably overhaul the whole system buy mid to high end and sell on the stuff that still works second hand to re coup most of the costs. I reckon i can still get 50% or more for the pump as it's only 2 years old. But it's not the one I wanted but it was the only one they had that would fit when the old one needed replacing.
The engineer said the boiler looked fine and it will definetely get me through at least one more winter. If my next boiler lasts over 20 years I'll be laughing.