Advice for DIY underfloor heating (7 zones, 2 floors, boiler control) using KinCony b

[torokzoli]

Hi,

I would like to ask for advice on which KinCony products would be best for controlling my water‑based underfloor heating system.

System layout:
Upstairs: 4 heating loops (manifold circuits) to be controlled separately.
Ground floor: 3 heating loops to be controlled separately.

In addition, I need to:
Switch the ground floor zone valve and the upstairs zone valve. 
Provide a boiler enable signal via a volt‑free (dry) contact.

The existing “dumb” system should remain functional in parallel at first:
There is one programmable thermostat for the upstairs and one for the ground floor.These currently control the boiler and the two main zone valves.

Hardware idea:

I already have a KC868‑A8, which I plan to use for the ground floor (3 loops + ground‑floor zone valve  + upstairs zone valve + boiler enable + some spare relays).

For the upstairs I am considering a KC868‑A6, which would handle the 4 loops and the upstairs zone valve. 

A small amount of wiring between the floors is possible.

Control requirements:
I would like the basic heating logic (room thermostats, loop valves, zone valves, boiler enable) to run locally on the KinCony devices themselves, without depending on any central controller (so that heating continues to work even if Home Assistant or the network is down).

At the same time, I would like to be able to override or adjust the behaviour from Home Assistant when desired (setpoints, manual on/off, etc.).

Questions:
Does the combination KC868‑A8 (ground floor) + KC868‑A6 (upstairs) make sense for this scenario, or would you recommend a different KinCony board combination for 7 loops + 2 zone valves + boiler enable?
What is the recommended way to implement the local control logic on these boards (KinCony original firmware rules, ESPHome, Tasmota, custom ESP32 code, etc.), given that:
It should work safely and autonomously.
It should still be easy to integrate with Home Assistant.

Could you recommend any wireless room thermostats that can communicate directly with KinCony hardware (for example via LoRa, nRF24L01, 433 MHz, or another protocol supported by KC868‑A series), so that I could replace the existing wired thermostats completely in the future?

Any wiring diagrams, example projects or firmware configurations for a similar 2‑floor underfloor heating system would be very helpful.

Thank you in advance for your support!

[admin]

suggest you chose F series board, just chose ESP32S3 chip product. that will support KCS v3, it's better. It can work without home assistant, support use tuya app and home assistant directly. actually not easy integrate to your own LoRa, nRF24L01, 433 MHz products. if you chose the product support RF433MHz RF receiver, our firmware support EV1527 or PT2262 wirelesss code.
KCS v3 firmware support integrate to home assistant by mqtt auto discovery, so you don't need any config , just zero code for integration.
you can chose product by this tool: https://mq.kincony.com/qq/product/product-selector

[torokzoli]

Hi, thank you for your suggestion.

I understand the advantages of the F‑series and the new KCS v3 firmware, but in my case I would prefer to stay with the more cost‑effective A‑series boards.

Could you please clarify one point for me?

What practical advantages do I gain with KCS v3 compared to KCS v2?
From what I can see, KCS v2 already supports Home Assistant integration, so I’m trying to understand whether upgrading to v3 would give me any essential benefits for my use case, or if it’s mostly improved convenience and newer hardware.

Thanks again for your support!

[admin]

Highly recommend KCS v3, it made by esp32s3, large memory size, more stable. KCS v2 is stop update.
KCS v3 support integrate to home assistant by mqtt auto discovery, zero config code.