Siemens Synco Living is a residential comfort system, built for apartments and dwellings using KNX RF wireless room units, not for commercial plant. When it lands in an office, school or mixed-use scheme, the spec has usually confused it with Synco 700 commercial controllers, and the result cannot scale, integrate or be properly supervised across a building.
The problem is that it keeps showing up in buildings it was never designed to manage. Walk enough plant rooms and risers across London and the South East and you start to recognise the pattern: a residential-grade Siemens product specified, installed and signed off in a building that needed a proper commercial BMS, because somewhere up the chain a drawing said "Siemens Synco" and nobody checked which half of the range it meant. By the time it surfaces, the building is occupied, the snagging period is closing, and someone is asking why the third floor cannot be scheduled from the front end.
Synco Living is Siemens' home automation and comfort platform. It is designed around an apartment or a single dwelling: a central apartment unit, wireless KNX RF room temperature units, radiator actuators, window contacts and the kind of consumption monitoring a landlord or resident wants for a flat. It does heating control, individual room comfort and some energy feedback well, within the boundary of one home. That is the design envelope, and within it the product is perfectly good.
The confusion is almost always with Synco 700. That is the commercial line: the RMU and RMK programmable controllers, RXB and RXC room and zone controllers, and the OZW web servers, all speaking KNX or, on the wider plant side, sitting alongside BACnet and Modbus devices in a structured network. Synco 700 is what you reach for on an AHU, a boiler sequence, a chiller interface or a multi-zone fan coil scheme. Same brand, same family name, entirely different job. Spec "Synco" without the suffix and you have left the door open for the wrong product to be ordered against a commercial scope.
It comes down to how specifications get written and read. A consultant names a manufacturer to keep the spec open and competitive. A contractor prices what the drawing says. A wholesaler supplies what was ordered. Nobody in that chain is necessarily a controls specialist, and "Siemens Synco" reads as a single product to anyone who has not lived in the range. CIBSE Guide H, which covers building control systems and how they should be specified, is clear that the controls design has to match the plant it serves and the way the building will be operated, monitored and maintained, not just name a vendor. When a spec skips that step, the brand survives the procurement process but the suitability does not.
Mixed-use schemes make it worse. A building with residential apartments above and commercial or amenity space below genuinely could use Synco Living in the flats. The risk is that the same product gets carried across the boundary into the commercial floors because it is already on the order, already familiar to the installer, and nobody flags that the office HVAC needs a different class of controller and a real supervisory layer.
The first thing that breaks is supervision. Commercial FM teams expect a head-end: a BMS front end where they can see every zone, pull schedules, acknowledge alarms, trend a sensor over a week and adjust setpoints across the whole building from one place. A residential-oriented scheme does not give you that. You end up with comfort control that works locally but cannot be driven centrally, so the FM team is walking the building to change settings that should take ten seconds at a workstation.
Then integration. Commercial buildings are never one manufacturer. There is an AHU with its own packaged controls, a boiler or heat pump with a Modbus interface, a chiller talking BACnet, metering, maybe a leak detection or air quality system. A proper commercial controller and supervisor tie those together. A residential platform was never meant to, so the integrator is left bridging systems that do not want to talk, or simply leaving plant stranded outside the BMS with no oversight at all. BS EN ISO 16484-5, the standard that defines BACnet, exists precisely so that multi-vendor building systems can interoperate at the data level. A scheme built on a closed residential product sidesteps that benefit entirely.
Scheduling and energy performance suffer next. Approved Document L expects buildings to control heating and cooling intelligently, with time control, zoning and the ability to avoid simultaneous heating and cooling. If the controls cannot hold proper occupancy schedules across commercial zones, or cannot be optimised from a central point, the building burns energy it should not, and the EPC and operational performance take the hit. For a landlord watching MEES, where commercial property has needed at least an EPC rating of E to let since 2023 and faces tighter thresholds ahead, an under-controlled building is a liability, not just an inconvenience.
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The tells are visible early if someone knows to look. Check whether the controls schedule actually distinguishes Synco Living from Synco 700, or whether it just says "Synco". Check whether there is a supervisor or web server specified at all, because a commercial building without a defined head-end is a red flag regardless of brand. Look at the points list: if commercial plant items have no clear controller and no route into a supervisor, the architecture is wrong no matter what is on the order.
On a mixed-use job, the question to ask is simple: where is the boundary between the residential comfort system and the commercial BMS, and is anything crossing it that should not be? If the same product is doing both, that is the moment to stop and re-scope, not after handover. BSRIA's Soft Landings guidance, BG 11, exists to keep design intent and operational reality aligned through commissioning and into early occupation, and it is exactly this kind of mismatch it is meant to catch before the building is live.
Good looks like the controls being chosen for the plant and the operation, then the brand following. On commercial HVAC that usually means commercial-grade controllers, Synco 700 if you are staying in the Siemens world, or any reputable BACnet-native platform, sitting under a genuine supervisor that the FM team can actually use. Every significant plant item is a controlled point with a route to the front end. Multi-vendor kit is integrated over BACnet or Modbus rather than left islanded. Schedules, setpoints, trends and alarms all live in one place.
On a mixed-use scheme, good means a clean, deliberate split. Synco Living, or an equivalent residential system, does the apartments and stays in the apartments. The commercial areas get their own controls and their own supervisor. The two are designed not to bleed into each other. This is the kind of upfront controls thinking we apply when scoping a BMS retrofit or new fit-out, because it is far cheaper to get the architecture right on paper than to unpick it from a riser after the building is occupied.
The honest answer is the earlier the better, and ideally before anything is ordered. If you are a consultant or main contractor and the controls schedule just says "Synco", clarify which product is meant and whether it suits the plant, now, while it costs a phone call. If you are an FM team or building owner who has inherited a building where the controls feel oddly limited, where you cannot schedule centrally or see half the plant, get the architecture reviewed before you sink money into working around it.
Replacing or re-scoping controls in a live commercial building is doable, and we do it regularly, but it is always more disruptive than getting it right at design stage. The cost of acting late is not just the kit. It is the energy wasted while the building runs blind, the FM hours spent managing it by hand, and the compliance exposure under Part L and MEES that comes with a building you cannot properly control.
Siemens Synco Living is a good residential product doing a job it was never built for whenever it turns up running commercial plant. The fault is rarely the kit and almost always the spec, a single ambiguous brand name surviving a procurement chain that nobody asked to think about controls architecture. The fix is to separate the residential and commercial worlds, choose controllers for the plant and pair them with a supervisor the FM team can actually drive. If you are unsure which Siemens product is on your drawings, or you have inherited a building that feels under-controlled, request a quote and we will review the controls scope before it becomes an expensive problem on site.
Specialist BMS installation, commissioning, and maintenance across London and the South East. SafeContractor Approved, BCIA Member.
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