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Is a Valliant Inline 6kW heater a BUS buster?

 
Air Source Heat Pumps (ASHPs)
Last Post by GuydeB 1 hour ago
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 GuydeB
(@guydeb)
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Joined: 2 months ago
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Topic starter 15/07/2025 5:27 pm  

Like many newbies desperately trying to ASHP an old house from oil fired, I have been down many rabbit holes - in brief, three phase not possible (£44K quote from National Grid), 18kW heat loss (Good Energy onsite survey), new ASHP-ready UFH in kitchen extension.

One recent suggestion was the (very expensive) Grant VortexAir 15/26kW Oil Boiler and 17kW Heat Pump Hybrid - definitely NOT BUS compliant, but at least a start.

However I might have cracked it - or have I?

I am considering a Vaillant aroTHERM plus 12kW combined with a Valliant Inline 6kW back-up heater. Looking initially for 45-55 degs flow temp to start (separating the UFH) while we change our rads over the next 12-18 months when finances allow. Plus keeping the existing Joule 300L tank (which we COULD use with just an immersion if ever required).

Is this BUS compliant?? We are replacing our old Grant Oil burner - we're rural and not on the gas network (yes we have wood burners but let's not go there!!).

Good Energy told me in their opinion this was NOT BUS compliant, my installer said it was but was told by the authorities that until he sends in the documentation they can't tell him (!), Chat GPT is convinced it is as well (!!), but surely I am replacing the fossil fuel with electricity throughout?

I'd welcome any thoughts....many thanks

this is the inline heater:

PROFESSIONAL.VAILLANT.CO.UK "https://professional.vaillant.co.uk/for-installers/products/inline-6kw-back-up-heater-42688.html"
Inline 6kW Back-Up Heater | Vaillant UK
Designed to be used with the aroTHERM heat pump range | Provides back-up boost during extreme cold snaps | Inbuilt temperature sensor and sensor pocket

This topic was modified 1 hour ago by GuydeB

   
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