Renewable Heating Hub Forums - Recent Topics

Vaillant Arotherm Pro vs new Plus

Batpred — Tue, 09 Jun 2026 17:37:55 +0000

We are considering installing a Vaillant Arotherm 7kw.

Heat Geek are now providing the Pro model, which has some advantages. We were lead to consider the new Plus, that apparently can be used with a wider range of cylinders. The trouble is that it still has no clear availability date.

I had the impression that any Heat pump type of cylinders would be compatible with any heatpump...

Octopus Fan #3 Bodmin Moor IFISA — Fastest Offer Close Ever?

Toodles — Tue, 09 Jun 2026 14:31:03 +0000

I had notification of an offer from Octopus Energy to invest in Fan #3 (Bodmin Moor) at about 11:00 this morning, I spoke to my Financial Advisor at 14:00 as I would like to invest with an IFISA… Having checked with him, I opened the OE Fan #3 offer page….. OFFER CLOSED!!!!! Must be something of a record! Regrets Toodles.

Regassing the aircon

Majordennisbloodnok — Mon, 08 Jun 2026 08:09:51 +0000

I'm not particularly expecting an answer, but I ask the question on the off-chance.

My EV is showing signs that the gas pressure in the aircon is getting low and so is struggling to cool things down properly in the hot weather. As a result, I need to get it regassed, but the problem is that it's got the optional heat pump in it and so is gassed with R744 (carbon dioxide). I'm struggling to find anywhere in the South East other than a main dealer who is equipped for this particular gas, and have wasted more than a little time with garages that say they can sort it because of the make and model before actually seeing it and realising they can't, courtesy of not listening to me initially.

Frustrating, but does anyone know of an outfit that can REALLY deal with R744, is based in the South East and doesn't charge an absolute fortune?

Solar Schematic – Switching FiT Providers

bontwoody — Sat, 06 Jun 2026 14:32:37 +0000

Could someone please cast your eyes over this schematic. Im trying to switch FIT providers and Octopus are asking for one. The original 3.68kW FIT array has been supplemented by a new 16.83kW solar array and a DC coupled battery. Obviously the FIT generation meter only measures the output from the FIT array. Have I made any stupid mistakes please :-)

15218

UPS to keep broadband and wifi available during power outages

downfield — Sat, 06 Jun 2026 10:14:22 +0000

We had a short power outage during a thunderstorm last week and when the power came back we had a wifi signal but no connection to the broadband signal.

This happens surprisingly often and also when an electrician turns the power circuits off for maintenance additions.

So my question is: is anyone using / can anyone recommend a UPS with about 500Wh capacity to keep the broadband working.

We need to power

1 a fibre /ONT box using 5 - 10W

2 the PlusNet2 router using 10W

3 a TP-Link 4 port hub supplying 3 PoE Wireless Access Points using 50W

so the total load is around 70W. Allow for 6 hours outage gives 420Wh so round up to 500Wh.

Note that all the units use different voltages so I don't think I can use a DC UPS.

How can I cool inverter and batteries during hot spells?

David999 — Fri, 05 Jun 2026 13:56:24 +0000

My loft is toast during the hot spells and currently I leave the door open but was thinking something more technical, like a fan. I was looking at a vortex controller for gardeners but uncertain if the switching works the same as the room stat I have switching in the wrong direction. I have bathroom fans spare but a suitable thermostat is the issue.

Any ideas from other folk what and if they try to cool inverter and batteries.