Bristan 2.0 bar single-ended shower pump review, researched

Research note: We haven't had or installed this pump. This review is based on Bristan's published product data and fitting instructions, not hands-on testing.

We haven't tested this. Figures are as the maker states them (checked 13 November 2026).

Our verdict

The ST PUMP20SG is a 2.0 bar single-impeller pump for one stored-water supply on a positive-head gravity system. It is a specialist choice, not a substitute for a twin pump: Bristan says its standard pumps are not suitable for boosting one side of a dual-flow mixer valve or tap. The attraction is compact, targeted boosting where the plumbing design genuinely calls for one impeller.

What it is

This is a flow-switched, single-speed peripheral pump that boosts one hot, cold or appropriately designed pre-mixed supply. It is for a vented stored-water system and needs positive head. It is not for direct mains boosting.

Key specifications

Official figures from the Bristan product page, technical data and fitting instructions, checked 14 November 2026.

Specification	Bristan figure
Product code/type	ST PUMP20SG; single-speed single impeller, positive head
Rating	2.0 bar / 17 L/min; 19 m closed-valve head on data sheet
Start flow	More than 0.8 L/min through the outlet being pumped
Electrical	230 V AC; 215 W; 5 A fuse; 1.5 m cable
Duty	30 minutes on / 30 minutes off on product data
Water temperature	4°C minimum; 65°C maximum
Connections	15 mm push-fit flexible hoses; two supplied
WRAS on data sheet	2007386, shown as expired 31 July 2025
Warranty	3 years on page badge and data sheet

The current page also says “5-year parts and 1-year labour” in feature copy, conflicting with its three-year badge and data sheet. The data sheet's WRAS expiry is in the past. Confirm the current approval and guarantee with Bristan rather than assuming either remains valid.

Installation and safety

The guide requires sufficient stored water, correct pipe sizing and hot-water take-off, an inline strainer, priming before starting and a location close to and below the cylinder take-off. The fixed supply uses a double-pole switched fused spur and must not share the boiler or immersion circuit.

Use a qualified plumber and qualified electrician. This is not a DIY installation guide and not gas advice. See hiring a plumber and WRAS and water regulations.

Owner evidence

We did not find enough readable, model-specific owner material to state owner themes. We have not treated retailer description copy as owner feedback.

Pros and cons

Pros: compact single-supply solution; automatic flow switch; clear maker performance data; anti-vibration feet and two hoses.

Cons: specialist single-ended application; positive head only; intermittent data-sheet duty; stale WRAS date and conflicting guarantee wording need checking.

Who it suits — and who should skip it

It may suit a positive-head, open-vented system where a plumber has specified boosting one hot, cold or pre-mixed supply. Skip it if both hot and cold need separate boosting, if the outlet lacks natural flow, or if the supply is mains-fed, combi or unvented. See shower pump sizing.

Alternatives

The Bristan positive-head twin boosts hot and cold separately; the Bristan universal twin covers negative head. The Stuart Turner Showermate S2.0 single is another 2.0 bar single. Also see shower pumps compared, noise and mains boosters.

How we researched this

We read Bristan's current product page, technical data and fitting manual, and the Wickes listing, on 14 November 2026. We have not owned, installed or tested this product.

Sources

Bristan product page; technical data; fitting instructions; Wickes listing. Opened 14 November 2026.