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New Vaillant aroTHERM Plus

Air Source Heat Pumps (ASHPs)

Last Post by Batpred 3 months ago

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Fred Gray

(@fred-gray)

New Member Member

Joined: 1 year ago

Posts: 4

Topic starter 13/07/2026 10:18 pm [#3097]

Would someone explain what these figures mean please, especially the heat output specs. I would like to know what the max output would be at -2 OAT and 45 flow.

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JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 4 years ago

Posts: 5476

14/07/2026 7:46 am

In a word no, I have never fully understood the test conditions for these standard tests which manufacturers are required to do.

Vaillamt data can be difficult to find, they seem to write a lot of different versions for different countries and then put it in different places on their website often in the installer only section which is inconsistently password protected. Not at all what I would expect from a German company.

for the plus we have the Czech data book, which was always the bible.

So far as I know nobody has yet found the equivalent for the pro, but I think this gives you the information you require.

This post was modified 3 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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Batpred

(@batpred)

Noble Member Member

Joined: 2 years ago

Posts: 1161

14/07/2026 2:57 pm

@jamespa

I was given the Installation and Maintenance instructions for the Pro (v 7.1, new Plus is 8.1). But the corresponding table has no explanation.

I would look for the specification of the EN 14511..

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC

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Batpred

(@batpred)

Noble Member Member

Joined: 2 years ago

Posts: 1161

14/07/2026 2:58 pm

There seems to be some info at

EHPA.ORG "https://www.ehpa.org/wp-content/uploads/2022/07/EHPA_Testreg_AA-HP_V1.3a_2021-06-22.pdf"

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC

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