Description
The APUMPHE is a compact, high‑efficiency permanent‑magnet circulating pump intended for primary circulation in domestic central‑heating systems. It uses an internal differential‑pressure controller to vary motor speed automatically in response to demand when left in its Auto mode; alternatively the installer can select a fixed speed between user‑adjustable minimum and maximum settings. The result is a modern replacement‑style circulator that focuses on low running cost, quiet operation and straightforward plumbing compatibility with standard UK systems.
Key specifications
- Dimensions: 130 × 130 × 128 mm (motor/housing)
- Hydraulic connection: 1.5″ G1 (BSP) threaded flange — 130 mm across ports
- Electrical: 220–240 V AC, 50 Hz
- Maximum head: 6 m
- Maximum flow: 3.0 m³/hour
- Energy performance: ERP‑compliant, Energy Efficiency Index (EEI) < 0.20
- Running power (varies with load): circa 5–45 W (auto‑adjusting)
- Noise level: < 43 dB(A)
How it works and where it fits
The APUMPHE is a canned motor circulator built around a permanent‑magnet (PM) motor. PM motors are commonly used in today’s low‑energy heating pumps because they keep electrical losses low at the part‑load conditions most domestic systems spend time in. In practice that means the pump draws only a few watts when the system demand is small (for example when only a single radiator calls) and increases power to maintain flow and differential pressure as more of the system opens up.
On Auto (differential‑pressure control) the pump continuously modulates its speed to hold a set relationship between flow and pressure, so it is generally a good fit for modern combi boilers, sealed system cylinders and system layouts where radiator thermostats, TRVs or zone valves vary the load. Where an installer prefers predictable fixed performance they can lock the unit to a constant speed within the device’s Min–Max range.
Installation and compatibility notes
Physically the APUMPHE uses a 1.5″ G1 BSP flange and a 130 mm port‑to‑port spacing, which makes it compatible with many existing domestic replacement points and standard flanged adaptors. It runs from a UK mains supply (220–240 V, 50 Hz), so electrical connection must be by a qualified installer in accordance with local wiring regulations and any boiler manufacturer instructions.
Because the pump is a sealed, canned‑motor design there’s no external shaft seal to service in the same way as older wet‑rotor pumps; nevertheless the usual site checks apply — correct direction of flow (arrow on body), adequate system filling and deaeration, and that the pump is protected by the right fusing and isolation. The manufacturer supplies a one‑page spec sheet and a downloadable instructions leaflet with wiring and installation guidance; installers should consult those documents for orientation limits, recommended wiring, and fault‑indicator behaviour before final commissioning.
Advantages and practical limitations
Advantages you’ll notice in day‑to‑day use are primarily running cost and noise. With an EEI below 0.20 and a PM motor that actively reduces power at light load, annual energy consumption will be significantly lower than legacy asynchronous three‑speed pumps. The stated noise level (under 43 dB(A)) makes it suitable for plantrooms or cupboards close to living spaces.
Limitations to bear in mind: the pump’s maximum head (6 m) and flow (3.0 m³/h) are typical for single‑dwelling systems but will not suit larger commercial circuits or installations requiring higher head. The 1.5″ flange and 130 mm spacing suit many domestic replacement situations but always check your existing pipework or flange adaptors before ordering. Also, the spec sheet and product page differ slightly on the top of the stated electrical power range (documented as circa 5–40 W in the datasheet and 5–45 W in product text); see the warnings below and confirm the figure that matters for your site calculations with the supplier or the printed datasheet supplied with the unit.
Practical advice for buyers
If you’re replacing an old heating pump and want lower energy bills with quiet operation, the APUMPHE is worth considering provided the pump’s head and flow match the system. Provide the installer with the pump’s port‑to‑port dimension and flange size so they can check flange adaptors or mounting brackets. Ask the fitter to confirm the pump orientation, ensure the system is fully flushed/treated where appropriate, and to record the pump setting (Auto or a locked Min/Max speed) for future reference.
Finally, check whether the seller or installer supplies a warranty and whether the pump’s spare parts and service support are available locally — domestic circulators like this are long‑lasting, but quick access to support makes a difference if you ever need a repair or replacement.
