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Electric shower, anything I can do?

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soldar:

--- Quote from: SteveyG on July 29, 2019, 10:01:19 am --- I'd also suggest a heat only boiler over a system boiler if you choose that route over a combi.
--- End quote ---

For the benefit of us, non-UKdians, can we get definitions of those terms? Just to make sure we are all on the same page.

And, yes, I find the prices of anything and everything in the UK absurdly high.

paulca:

--- Quote from: SteveyG on July 29, 2019, 10:01:19 am ---I would be interested to see the evidence behind that statement. It's easier for the installer to put in a combi and offers greater profits. If it's a boiler replacement only, I would get additional quotes. Those are BG prices!

As mentioned before, I'd also suggest a heat only boiler over a system boiler if you choose that route over a combi.

What did he measure as the water parameters? (Flow, dynamic & static pressure etc)

--- End quote ---

The cost of the tank for a dual immersion, single coil is £600-800 alone.  There is some additional plumbing required.

He measured the mains flow rate just which was 14 lpm, the combi boiler requires 10 minimum.

I'm still not sure what you mean by heat-only boiler.

paulca:

--- Quote from: soldar on July 29, 2019, 10:15:26 am ---
--- Quote from: SteveyG on July 29, 2019, 10:01:19 am --- I'd also suggest a heat only boiler over a system boiler if you choose that route over a combi.
--- End quote ---

For the benefit of us, non-UKdians, can we get definitions of those terms? Just to make sure we are all on the same page.

And, yes, I find the prices of anything and everything in the UK absurdly high.

--- End quote ---

As I understand them...
System boiler = a single out/return boiler that feeds through a heat exchanger coil in the hot tank before circulating the radiators, thus providing both hot water and radiators.  With or without the "S plan" diverter valves to switch between hot water only and/or radiators.

Combi = Combination boiler.  Provides an out/return for the radiator circuit and separately a direct inline on-demand hot water heater.  If you turn a hot tap on it immediately fires up and heats the hot water.  Turn the tap off, it shuts off.  There is no hot water tank or reservoir.

https://www.worcester-bosch.co.uk/products/boilers/explained

SteveyG:

--- Quote from: paulca on July 29, 2019, 10:20:17 am ---
--- Quote from: SteveyG on July 29, 2019, 10:01:19 am ---I would be interested to see the evidence behind that statement. It's easier for the installer to put in a combi and offers greater profits. If it's a boiler replacement only, I would get additional quotes. Those are BG prices!

As mentioned before, I'd also suggest a heat only boiler over a system boiler if you choose that route over a combi.

What did he measure as the water parameters? (Flow, dynamic & static pressure etc)

--- End quote ---

The cost of the tank for a dual immersion, single coil is £600-800 alone.  There is some additional plumbing required.

He measured the mains flow rate just which was 14 lpm, the combi boiler requires 10 minimum.

I'm still not sure what you mean by heat-only boiler.

--- End quote ---

A system boiler has everything except the cylinder internal to the unit, so even if you just need to replace the diverter or pump, you have to disassemble the boiler to get to those parts (and also be gas safe...)

A heat-only boiler just has the heat exchanger and a flow and return to the boiler. You have everything else separate making it more customisable and maintainable . You can buy an Intergas 24kW heat-only for less than £700. System boiler comes in around £1100 and a similar (Intergas Xtreme) combi is close to £1800. Unless massive work needs doing, both end up around the same £2000-3000 in total.

The installer doesn't want the work if he's quoting £4000

More often than not, you will pay a premium for a system boiler over a heat-only boiler. Even after buying the parts separately.

paulca:

--- Quote from: SteveyG on July 29, 2019, 10:34:31 am ---The installer doesn't want the work if he's quoting £4000

More often than not, you will pay a premium for a system boiler over a heat-only boiler. Even after buying the parts separately.

--- End quote ---

So looking at that link I posted:
https://www.worcester-bosch.co.uk/products/boilers/explained

A heat-only is what I currently have.  Including the header tanks in the attic and a vented, non-pressurized system which is just poor on terms of upstairs water pressure, in particular showers.

On the cost.  The boiler itself is probably around £1300-1600, installation is probably 2 or 3 guys over 2 days.  So the labour costs around going to be somewhere close to £800-1000 + addition parts, boiler control panel, radiator TRVs, 3 new radiators + fitting, etc. etc.  So £2700 ball park sounds about right.

Then add in the cost of the unvented tank which is £600-800 and we are already at £3500, so the plumber is only adding £500 for additional work for plumbing and setting up the hot tank.  The £4000 was just when I asked him for a finger in the air estimate if I was to choose system boiler.

https://www.screwfix.com/c/heating-plumbing/hot-water-cylinders/cat830956

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