Last updated: 19 July 2026 · Originally published March 2026 · By James Wright
Last checked: 19 July 2026. This is a research-led guide based on manufacturer documentation and UK availability, not a hands-on Smart Home UK test.
tado° V3+ is a previous-generation family. It can still suit an existing V3+/V3/V2 installation or verified clearance purchase, but it is not the default choice for a new system.
V3+ and tado X are separate systems
tado X uses Matter over Thread. Its thermostats, bridges and add-ons are not compatible with V3+/V3/V2 hardware. Do not buy an X add-on for a V3+ home, or a V3+ add-on for an X home.
Compatibility and ongoing cost
Use tado’s exact compatibility flow for the boiler and UK receiver. Core scheduling works without a paid plan; Auto-Assist is optional. Confirm the current subscription price, clearance stock, included receiver, warranty and add-on availability before buying.
Evidence note
Smart Home UK has no accessible notes, photographs, purchase records or measurements supporting the former full-winter Vaillant test. Those measured savings and first-person claims have been removed.
FAQ
Does V3+ still work?
Yes, in a compatible existing system and with supported services.
Can V3+ and tado X devices be mixed?
No. Treat them as separate hardware families.
Does V3+ require Auto-Assist?
No. It is an optional paid service.
Should a new buyer choose V3+?
Usually only for a documented value or migration reason; compare the current tado X family first.
Smart Home UK Team - Research-led UK smart-home editors who compare manufacturer specifications, UK availability, verified owner feedback and authoritative sources. Independent. No sponsored placements.