True but heatpump is not visible on main vrm page (“flow chart”) evcs is visible
I personally would not replace a gas heating (especially with a LPG Tank on site) with a heat pump and depend solely on electricity.
As a supplement for the heat pump, a gas system could help in case of power outage, it needs fewer energy than a heat pump for emergency operation in the winter where PV ist not much effective (only some pumps and control).
You should add an intelligent control (what is needed, Electricity or Heating or both at once). If you add a combined heat and powerplant (e.g. Dachs) to the system the main control unit can priorize and combine the sources as needed and the PV delivers or can activate the powerplant to charge the battery in the winter times and use the waste energy for heating (separate or combined with the heat pump so it can use hot cooling water of the hot PP and don´t need to activate it´s heating rod)
i totally agree, i will also keep my gas heater with the tank
Not only for power outages, but a heat pump is a very complicated system with special parts that are not easy to get /replaced in short time
I have a cheap Panasonic Heat Pump - about 3500€ - if it would be broken with a severe problem, i know from the time i bought it i will just replace the complete unit
I’d say “it depends”. The gas boiler I’ll be replacing with a heat pump soon runs on gas from the pipe, so in case of a widespread blackout the gas pumping station will also go dark sooner or later. For that case I still have a wood stove.
No, because a heat pump is actually superior to a gas boiler—even if the electricity powering the heat pump comes entirely from a gas-fired power plant. This can easily be demonstrated with a simple calculation. On average, a condensing gas boiler operates with an efficiency (based on calorific value) of approximately 92%, in the very best case 0.95%. This means it generates 0.92 to 0.95 kWh of useful heat from 1 kWh of gas.
A combined-cycle gas turbine (CCGT) power plant achieves an efficiency of 62% relative to the calorific value. Consequently, it produces 0.62 kWh of electricity from 1 kWh of gas. On average, 4% of the electricity is lost during grid transmission, meaning 0.6 kWh actually reaches the home. Even a really poor heat pump achieves a seasonal performance factor (SPF) of around 3.5, turning that 0.6 kWh of electricity into 2.1 kWh of useful heat—more than double what a gas boiler can produce from the same amount of gas. A high-quality heat pump, however, achieves an SPF of 5; using electricity from a CCGT plant, it would generate a full 3 kWh of useful heat from that initial 1 kWh of gas.
Conclusion: The heat pump is by far the most efficient and sustainable heating method, even when the electricity powering it is generated from fossil gas.
I live in Germany, which has one of the most stable power grids in the world; I haven’t experienced a single blackout in the last 10 years, and in my 70 years of life, I’ve never experienced one lasting longer than an hour. Yet, you don’t have to be a hardcore prepper to want a backup heating system. Natural gas is not a long-term solution, as the distribution network is already being dismantled. I have a wood-burning stove; I love the fire so much that I use it occasionally anyway. Christmas with a crackling fireplace is unbeatable.
@Hans_Meiser I’m in the process of ordering a Nibe S1257 (to be installed in October). I preferred Nibe because of their open interface on the S-series (Modbus-TCP), offering over 1000 readable datapoints and lots of writable registers. Nibe has documented Modbus quite well in Technical Information document M12676EN: https://assetstore.nibe.se/hcms/v2.3/entity/document/878103/storage/ODc4MTAzLzAvbWFzdGVy (afaik is 2608 their latest version).
Nibe impressed me also by publishing their firmware update history: https://www.nibe.eu/webdav/files/myuplink_changelog/nibe-n.pdf. According this overview Nibe also introduced a REST API in August last year. Reportedly offering hundreds (!) of writable registers. EEBUS-support followed in October.
During my search for the ‘best’ heat pump, I have not found any other manufacturers who make as much technical information available as Nibe does.
So Nibe might be the heatpump of your choice, providing both basic EEBUS-functionality to Victron-GX (covering your initial question) but also Modbus/REST-API support for more sophisticated use cases in the future (like Building Management Systems or Home Assistant or other smart home systems).
what do you want to write in these registers?
My learning: just a few settings needed like
- Target Temperature
- Temperature spreading
- some schedules
Do you manually override settings like ignition angle on your car?
I have over 300 Entities from the bosch heatpump with ems-esp on homeassistant, nice but not all are usefull, i only use about 20 of them, a few temp, a few sensors and some settings…
you dont really need that many entities or registers, most off them are not usefull at all
@kr0815 I didn’t want to scare anybody, when mentioning these far better than average possibilities that Nibe offers. Meaning you have lots of choice (no obligation 
) to interact with your heat pump. Afaik many (most?) writable registers cover a setting that also can be changed via the control panel. Same applies to the readable registers, showing information that also can be found via the menu on the control panel.
Hundreds of registers might feel like ‘overkill’ when you need only 3 thermostat like settings and never change anything else of your heatpump settings. In that case, just keep things simple and ignore the remaining 1000 registers.
But owners of a smart home or an energy management system might appreciate the many readable and writable registers, especially when having controllable equipment in their heating system. Still: Like @DuivertNL mentioned, in the end one might use only 20 registers.
Also some (tech savvy) people might want to tweak their system to get an even better performance. Like some people indeed tweak (‘çhip’) their car’s engine to get more power or to use less fuel.
Referring to the initial question (Which heat pump works best with Cerbo GX?), the definition of ‘best’ varies according someones requirements: is a heatpump fit for my (personal) use? Basic requirements might be met by many heatpumps. The more tech savvy, the more (or more specific) requirements, the less choice of heatpump brands.
Nibe can serve both basic and more sophisticated requirements, so might be a ‘non regret’ choice for now and for next 15 years of lifespan.
I wrote here in case of emergency operation!!
Sure the heat pump is the most efficent heating method —if you have enough power!
In the winter time the PV is not efficient, sun radiation is low. So you can not power a xxkW (electricity power) heat pump which generates xxxxxxxBtu (heating power) .
As backup, or as add on (heatpump gets iced up or inefficient at very low temperature) a conventional heating is still useful.
The German grid gets more and more unstable (check the list of the redispatch means p.a.) because of too many static inverters (and no external control of these) and too few rotary inverters (the rotating mass “stores” the energy and prevents the grid from sudden spikes).
No, that is not the case. The measure of an electricity grid’s stability is the frequency and duration of power outages. In Germany, the number and the average duration of power outages has continued to decline steadily over the past 30 years—that is, since the start of the energy transition. The SAIDI value, which tracks all power outages lasting longer than three minutes for the purpose of international comparison, is consistently falling. In 2006, the SAIDI value in Germany stood at 21.53 minutes; by 2024, it had dropped to just 11.7 minutes.
Opponents of the energy transition cite the ever-increasing number of necessary grid interventions (redispatches) as evidence of growing instability. But that is nonsense, because these interventions actually keep the system stable. Logically, the number of redispatches must rise as the system becomes increasingly decentralized.
The SAIDI number is not suitable in this case (outage at the consumer level). The interventions are more frequent and higher every year.
I say this will be a problem in the near future without suitable control means. Tom, you can not drink it pretty when also higher prices must be paid due to more and higher redispatch interventions.
some sources below
Who cares? The number of interventions has absolutely nothing to do with grid stability. The number of interventions is just as high as necessary to keep the grid stable.
And of course the ONLY relevant measurement for grid stability is the SAID value. This value has been introduced exactly for the purpose to compare stability of different grids.
Germany’s grid ist one of the most stable all over the world with 11.7 minutes in 2024, and it’s stability got higher and higher over the last decades. In Europe only Switzerland was better with 10 minutes, France with it’s many nuclear powerplants has a value of 50 minutes. USA is 80 minutes.
No, the SAIDI number is defined like
“Der System Average Interruption Duration Index, kurz Saidi, gibt an, wie lange die Letztverbraucher in einem Jahr durchschnittlich von ungeplanten Stromunterbrechungen betroffen waren”
Not the outage on the Distribution level (in German, Mittelspannung, Höchstspannung)
Now back to topic!!
Mein Gott, genau das ist die Definition von Stabilität. Je mehr und je längere Ausfälle es gibt, als desto instabiler gilt das Stromnetz. So schwer kann das doch wirklich nicht zu verstehen sein.
Ich will den Beitrag nicht weiter zerlegen aber der SAIDI Wert bezieht sich auf den Endverbraucher-Stromausfall.
Redispatch läuft aber im Verteilernetz ab (Mittelspannung, Höchstspannung), da gibt es keine normalen Endverbraucher sondern Gewerbe/Sonstige die teils eigene Trafos betreiben. Ich habe als Endverbraucher keinen 20 kV Trafo in Betrieb!!
Ist das so schwer zu verstehen, Äpfel kann man nicht mit Birnen vergleichen!!
Zurück zum Thema Wärmepumpen!!
… und Redispatch nicht mit Netzstabilität.
Schauen wir doch mal was die KI dazu meint:
" Das deutsche Stromnetz gehört zu den zuverlässigsten der Welt. Ein flächendeckender Blackout ist nach Angaben der Bundesnetzagentur äußerst unwahrscheinlich. [1, 2, 3, 4]
Die Stabilität in Zahlen:
- Ausfallzeit (SAIDI-Wert): Der durchschnittliche Verbraucher in Deutschland war in den vergangenen Jahren jeweils nur knapp 11 bis 14 Minuten pro Jahr ohne Strom. [1, 2]
- Verfügbarkeit: Die Versorgungssicherheit liegt damit konstant bei über 99,99 Prozent. [1]
- Internationaler Vergleich: Deutschland belegt europaweit und global regelmäßig Spitzenplätze, nur wenige Länder wie Japan verzeichnen noch kürzere Ausfallzeiten. [1, 2]
Trotz des rasanten Zubaus von erneuerbaren Energien und dem schrittweisen Kohle- sowie Atomausstieg bleibt das Netz durch automatische, europaweite Regelsysteme im Millisekundentakt stabil. Bei wetterbedingten Schwankungen greifen Netzbetreiber präventiv ein."
In that case it would be more efficient to run a gas powered generator and use that to power the heat pump?