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NIBE 1140 - what is mean time before failure? Installed 2009 and now struggling to heat hot water

Ground Source Heat Pump (GSHPs)

Last Post by AliRam 5 months ago

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AliRam

(@aliram)

New Member Member

Joined: 6 months ago

Posts: 5

Topic starter 20/05/2026 8:48 pm [#3012]

We have had a lot of problems in the last year, and it has finally stopped heating the water beyond about 28C, despite trying it on hot water only.

We are talking to NIBE about replacing it, but there is since a lead time with installers in SE Scotland. At the moment we have no way of heating water.

This topic was modified 6 months ago 2 times by Mars

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NIBE GSHP

Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4965

21/05/2026 6:57 am

Sorry to hear that @aliram.

While you’re waiting on NIBE and an installer, the simplest stopgap is going down the immersion route. If your cylinder has an immersion boss, an electrician can have one fitted relatively quickly and inexpensively. Worth checking the cylinder first though, as some unvented cylinders have the boss blanked off rather than fitted with an element.

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Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4965

21/05/2026 6:58 am

@aventus-eco is this something you could assist with?

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AliRam

(@aliram)

New Member Member

Joined: 6 months ago

Posts: 5

Topic starter 21/05/2026 8:20 am

@editor thank you - our tank is of course huge - we have 2.5km of slinkies (I think) how can I tell there is a blanked off boss

is it one of those at the bottom ? Sorry I edited the pic but it went dark

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Mars

(@editor)

Illustrious Member Admin

Joined: 6 years ago

Posts: 4965

22/05/2026 11:33 am

I can't see one there @aliram, but I'm hoping that @ashp-bobba and @aventus-eco can have a quick look for the professional perspective!

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ASHP-BOBBA

(@ashp-bobba)

Prominent Member Member Professional+

Joined: 2 years ago

Posts: 503

22/05/2026 12:15 pm

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.

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ASHP-BOBBA

(@ashp-bobba)

Prominent Member Member Professional+

Joined: 2 years ago

Posts: 503

22/05/2026 12:15 pm

Hard to tell but I think I have placed the arrow on what you are looking for?

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.

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AliRam

(@aliram)

New Member Member

Joined: 6 months ago

Posts: 5

Topic starter 09/06/2026 10:59 pm

@ashp-bobba hi there everyone sorry to take so long to respond - you have all been so helpful.
we now have 2 immersions fitted to the hot water tanks - which actually is NiBE branded.
very very grateful to this forum for the heads up about possibility of immersion fitting.

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AliRam

(@aliram)

New Member Member

Joined: 6 months ago

Posts: 5

Topic starter 09/06/2026 11:16 pm

@editor thank you so much for- see below - we have immersions -very grateful 🙏🏻👏👏👏👏👏👏

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AliRam

(@aliram)

New Member Member

Joined: 6 months ago

Posts: 5

Topic starter 09/06/2026 11:18 pm

Sadly we also have rodent damage to the hot water system but the immersion heaters have allowed us to isolate the leak and at least feed 1 shower.
good news all round.

I am most grateful. Thankyou everyone who replied .

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