Cold water storage tank replacement in Macclesfield
In short
The cold water cistern in the loft feeds the cylinder and, on older systems, the bathroom. Old galvanised or uncovered tanks should be replaced with a modern plastic cistern with a close-fitting lid, screened vent and overflow, insulated on the sides and lid but never underneath.
Also called: loft tank replacement · water tank in loft · cistern replacement · tank lid and insulation
Storage cisterns matter for water quality as much as supply. An uncovered tank is open to loft dust, insects, and occasionally worse — and the water in it feeds your bath and, on older installations, sometimes a tap. The water regulations require a close-fitting lid, screened vents and screened overflow precisely to keep contamination out, and old open tanks predate all of that.
Galvanised steel tanks corrode from the inside and eventually leak — a leak located in the loft, above everything else in the house. Replacing one with a modern polyethylene cistern is a straightforward job made awkward only by the access: getting an old rigid tank out through a loft hatch sometimes means cutting it up, and modern flexible tanks are chosen partly because they can be squeezed through the opening.
Insulation follows the same rule as pipework: sides and lid, never underneath. The tank relies on warmth rising through the ceiling from the room below to stop it freezing, and insulating beneath it removes exactly that. With modern loft insulation levels the loft is a much colder place than it used to be, so tanks and their pipework need proper attention.
Stagnation is worth thinking about in a lightly used property. Stored cold water sitting warm and undisturbed is where legionella bacteria multiply, and cold water should be kept below 20°C. In a loft in summer that is not always achievable, which is one of several reasons unvented systems — with no stored cold water at all — have become the norm on upgrades.
While the tank is being replaced is the time to fit a proper isolating valve on its feed, renew the float valve, and check the overflow and warning pipe discharge to somewhere visible outside.
What the job covers
- Removal of old galvanised or damaged cisterns
- New WRAS-approved cistern with lid, screened vent and overflow
- Float valve renewal and level setting
- Insulation to sides and lid, clear underneath
- Isolating valve and correct overflow/warning pipe arrangement
- Pipework connections, flushing and testing
What it costs
We don't publish a price for this yet, because a number pulled out of the air is worse than no number at all — your plumber has to honour it. You'll get a firm price for your actual job when they ring you back, before any work starts. The quote itself is free and there's no obligation either way.
Common questions
Does my loft tank need a lid?
Yes — a close-fitting lid with screened vents is required to keep contamination out of stored water. Open tanks are a legacy arrangement that no longer meets the regulations.
Can I get rid of the tank altogether?
Yes, by converting to an unvented cylinder or a combi, provided the mains supply can deliver enough flow. That removes the loft tanks, the freezing risk and the stored-water hygiene question in one go.
Need this doing in Macclesfield?
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