Grundfos Shower Pumps

Twin impeller pumps boost both your hot and cold supplies at once, which keeps a mixer or thermostatic shower stable and is what you'll normally want for modern mixer showers. Single impeller pumps only boost hot or cold, useful if only one feed is underperforming (if only the hot feed is gravity-fed and needs a lift). If you use a mixer shower or want balanced pressure into a mixer valve, a twin impeller pump is the safer choice.

Positive head pumps are used where there is some existing water pressure at the shower; negative head pumps are made to work when the supply tank is lower than the shower outlet and the pump must lift water; universal head pumps work in both situations. The correct head type ensures the pump can prime and deliver the stated boost reliably, so choosing the right type avoids loss of flow or cavitation. Several Grundfos models are offered in positive, negative and universal heads, giving you flexibility depending on how your water feeds are arranged.

Grundfos pumps on this page are rated at 1.5, 2, 3 and 4 bar. A 1.5 bar pump gives a modest, steady boost suitable for a small bathroom or low‑flow shower; 2 bar is a sensible mid‑range lift; 3–4 bar delivers a much stronger flow for larger showerheads or multi-outlet setups. If you want a powerful rain or multi‑jet shower, aim for the 3–4 bar models.

Grundfos designs these pumps to be quiet in use: compact dimensions, integral controls and anti‑vibration feet all help keep noise to a minimum. You'll find the anti‑vibration feet particularly useful in reducing the transmitted vibration into pipework and bathroom fittings. In practice that means a noticeable reduction in rumble compared with older, non‑isolated pumps.

Both materials are offered: four brass and four plastic models in our range. Brass bodies are heavier and more robust, so they're a good match for busy family bathrooms and long service life; plastic options are lighter, often cheaper and resist corrosion. For a high‑use shower you may favour a brass pump, while a plastic model can be a sensible, cost-effective choice for lighter use.