Notes on builds, parts and thermals

If you've started researching custom water-cooled PCs, you've probably noticed the prices vary wildly — from around £1,500 to well over £5,000. That's a big range, and it can make budgeting for your build genuinely confusing. Here's what actually drives the cost, so you know what you're paying for and where your money goes.

The short answer

A custom water-cooled PC in the UK typically costs £1,800–£3,500 for a solid gaming or content-creation build, and £3,500+ for high-end workstations or builds with hardline tubing and premium aesthetics. The final number depends on four main factors: components, cooling complexity, case size, and finishing details.

What actually drives the price

1. Core components (CPU, GPU, motherboard, RAM)This is usually the biggest chunk of the budget — often 60–70% of the total cost. A mid-range gaming build with a strong CPU and GPU pairing will cost less than a workstation built around a top-tier processor or professional-grade graphics card. Component prices fluctuate with the market, so this is worth checking close to when you're ready to order.
2. Cooling complexity: soft tubing vs hardlineSoft tubing (flexible, bends easily) is more affordable and quicker to install. Hardline tubing (rigid acrylic or PETG, bent and fitted precisely to the case) looks significantly sharper but takes far more time and skill to get right — every bend has to be measured, heated, and shaped by hand. This is one of the biggest cost differences between a "water-cooled PC" and a genuinely custom loop.
3. Number of loops and components cooledCooling just the CPU is the simplest and cheapest option. Adding the GPU to the loop, or running a dual-loop system, means more radiators, more fittings, more coolant, and more design work — all of which add to the final price.
4. Case size and layoutLarger cases give more room for radiators and clean cable/tube routing, but they also cost more themselves and may need larger or additional radiators to keep performance optimal. Compact builds can look stunning too, but often require more precise (and time-consuming) planning to fit everything in.
5. Finishing touchesRGB lighting, coloured coolant, custom cable sleeving, and engraved or anodised fittings all add polish — and cost. These are usually the easiest areas to flex your budget up or down depending on priorities.

A rough cost breakdown

Build type	Typical UK price range
Entry-level water-cooled gaming PC (soft tubing, single loop)	£1,500–£1,800
Mid-range gaming/creator PC (soft or hardline, single loop)	£1,800–£3,200
High-end gaming PC (hardline tubing, CPU + GPU loop)	£3,200–£4,500
Premium workstation or showcase build	£4,500+

These figures are indicative — every build is quoted individually based on your exact specification.

Why custom builds cost more than pre-built PCs

It's a fair question, especially when big retailers advertise pre-built systems at lower prices. The difference comes down to what you're actually paying for: a pre-built PC is mass-produced, air-cooled by default, and built to a generic spec. A custom water-cooled build is designed around your specific hardware, thermal goals, and aesthetic — assembled, tested, and fine-tuned by hand rather than on a production line. You're paying for the craftsmanship and the tailored engineering, not just the parts.

Getting an accurate quote

Because so much depends on your specific goals — performance targets, aesthetics, budget — the best way to get an accurate price is to talk through what you want directly. We'll walk you through the options and put together a spec that fits your budget without cutting corners where it matters.

Short answer: it depends on what you're actually trying to fix. If your only problem is noise under load, a good AIO or a well-tuned air cooler often gets you 90% of the way there for a fraction of the cost and none of the maintenance.

A full custom loop earns its cost when you're cooling more than one component — CPU and GPU in the same loop, for instance — where an AIO simply can't help. It also wins when the loop layout, tubing and coolant colour are part of what you want the finished PC to look like, not just how it performs.

Where we'd talk you out of it: if you're not planning to keep the system for several years, or your case genuinely can't clear the radiator sizes needed for the thermal load you're generating. We'll tell you this at the consultation stage before you spend anything on parts.

Hardline looks sharper and holds its shape, but it's unforgiving — every bend is measured and cut once, so a case swap or component upgrade usually means rebuilding the loop from scratch.

Soft tube is more forgiving to work with and far easier to adjust later: pull a fitting, add a component, reroute a run, and you're back up in an afternoon rather than a weekend. It doesn't hold the same razor-straight lines, but a well-dressed soft tube loop still looks deliberate rather than messy.

Our rule of thumb: hardline for a system you're building once and keeping as-is; soft tube for anything you expect to keep upgrading piece by piece.

This client came to us with a solid air-cooled build that had simply gotten loud — a chunky tower cooler and three case fans running flat out under any real load.

The case had room for a single 360mm radiator up top, which settled the design early: a single loop covering CPU and GPU, soft tube for flexibility, and a reservoir mounted where the old fan controller used to sit.

The full conversion took just under a week, most of it waiting on a replacement GPU backplate. Load temperatures dropped from the low 80s into the mid 60s on the CPU, and the case fans now barely spin up under normal use.

Every system sits on the bench for 48 hours before it goes anywhere, and that time is split into three distinct checks rather than just "left running".

First, a pressure and leak test with the system powered off — fittings and joints are inspected under bright light with paper towel beneath every connection, checked again at the 12 and 24 hour marks.

Second, a sustained thermal load test with the actual CPU and GPU under synthetic full load, watching for temperature drift that would suggest an airlock or a restricted flow path. Third, a power-cycle test — the system is shut down and restarted several times to catch any pump priming issues before you ever see them at home.

Dye-based coolants fade with UV exposure and time in the loop, usually most visible after a few months. It's cosmetic, not a sign anything's wrong, but it catches people off guard.

If colour retention matters to you, we'll generally recommend a pre-mixed, UV-stable coolant over adding dye to distilled water yourself — it costs more but holds its colour for much longer and won't stain your tubing or blocks over time.

Either way, plan on a full loop flush and refill roughly once a year regardless of colour — it's cheap maintenance that keeps flow rates where they should be.