Every time a sealed heating system heats up, the water inside expands — and without somewhere for that expansion to go, you get pressure spikes that strain the boiler, stress pipework joints and shorten system life. The Cimm ERE 18 absorbs that expansion, keeping system pressure stable through normal heating cycles.
Manufactured to PED 2014/68/UE and EN 13831, and independently confirmed as rated to a maximum operating pressure of 4 bar, the vessel is pre-charged to 1.5 bar with a working temperature range of -10°C to +100°C. It uses a fixed rubber diaphragm rather than a replaceable membrane, so unlike Cimm's potable water range, this is a sealed-for-life unit rather than one designed for membrane servicing. This is a non-potable vessel and must not be fitted on drinking water systems.
Key Features & Benefits
An undersized or missing expansion vessel is one of the most common causes of pressure-related boiler faults, and this 18 litre unit is sized to handle normal expansion cycles in a larger domestic sealed system without over- or under-compensating. The fixed diaphragm means there's no membrane to service — it's a genuine fit-and-forget component. Just remember it's for heating and refrigeration circuits only, not for drinking water systems.
Order the Cimm 18 Litre Central Heating Expansion Vessel online today.
| Manufacturer | Cimm |
|---|---|
| Model | ERE 18 |
| Standards | PED 2014/68/UE and EN 13831 |
| Capacity | 18 Litres |
| Dimensions (H x Diameter) | 395 x 285mm |
| Connection | 3/4" BSP Male |
| Pre-Loaded | Yes – Pre-Loaded to 1.5 Bar |
| Max Operating Pressure | 3.5 Bar |
| Working Water Temperature | -10 to +100°C |
| Potable Water Use | No – Non-Potable Applications Only |
| Membrane Type | Fixed Rubber Diaphragm |
| Application | Sealed Heating System |
| Product Type | Central Heating Expansion Vessel |
