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G3 Qualified · Cylinder Replacement

Unvented Cylinder Replacement in Orpington, Bromley and South East London

Supplied and fitted from £1,550, with no VAT to add. I’m G3-qualified for unvented hot water systems, and I do the job myself. No subcontractors.

G3 Qualified
No VAT to Add
No Subcontractors

Cylinder Replacement

  • From £1,550 supplied and fitted, no VAT
  • Old cylinder removed and disposed of
  • New inlet group, expansion vessel and T&P valve
  • Commissioned, with the warranty registered
  • Gledhill, Joule, Telford & Kingspan Albion

Qualified, registered and insured

  • REFCOM logoREFCOM registeredCertificate REF1026174
  • City & GuildsLevel 2 plumbing
  • LCL AwardsF-gas and ASHP Level 3
  • CIPHE logoCIPHE memberChartered institute
  • F-gas certifiedRefrigerant handling
  • ASHP Level 3Air source heat pumps
  • G3 unventedHot water cylinders
  • WRAS Water RegulationsQualified installer
  • £2m insuredPublic liability
Is It Time?

When Is It Time to Replace?

If your unvented hot water cylinder is getting old, keeps losing pressure, leaks, or just can’t keep up with your household any more, it might be time for a new one. I supply and fit unvented cylinders across Orpington, Bromley, Petts Wood, Chislehurst, Sevenoaks and south east London.

Most unvented cylinders last around 20 to 25 years if they've been serviced. It's usually worth replacing yours if:

  • it's 15 years or older and starting to need regular repairs
  • it's leaking from the cylinder itself, not just a valve
  • it keeps losing its air gap or expansion charge, which is common on older Megaflo models
  • the hot water runs out too quickly for your household
  • you're switching to a heat pump and need a heat pump cylinder with a larger coil
  • parts for your model are no longer available

If you're not sure, I can check it over at a service visit and give you an honest answer on repair or replace.

What's Included

What's Included in the Price

  • a new unvented cylinder from a leading UK manufacturer, sized to suit your home
  • removal and disposal of your old cylinder
  • a new inlet control group, expansion vessel, and temperature and pressure relief valve (supplied with the cylinder)
  • connection to your existing hot and cold pipework and heating
  • tundish and discharge pipework brought up to the current G3 regulations where needed
  • filling, testing and commissioning
  • registration of the manufacturer's warranty
  • a completed commissioning certificate for your records
Pricing

What Affects the Price

The starting price covers a straightforward like-for-like swap in the same position. The price can go up if:

  • you want a larger cylinder than you have now
  • it's in a loft or awkward space
  • the discharge pipework needs re-running to meet the regulations
  • you're changing from a vented (tank-fed) system to unvented, which involves more pipework changes
  • it needs a heat pump cylinder rather than a boiler cylinder

I'll give you a fixed price after a quick look at the job, so there are no surprises.

Why Smith EcoFlow

Why Use Smith EcoFlow

  • G3 qualified for unvented hot water systems
  • 22 years in plumbing, City & Guilds Level 2, CIPHE member
  • Father-and-son firm based in Orpington. You deal with me directly.
  • No VAT to add, so you don't pay the 20% VAT that VAT-registered firms have to charge
  • £2m public liability insurance
FAQ

Cylinder Replacement Questions

A straightforward replacement starts from £1,550 supplied and fitted, with no VAT to add. Larger cylinders, loft installations or extra pipework changes cost more. I'll give you a fixed price before any work starts.
Most like-for-like replacements are done in a day. You'll be without hot water for part of that day.
Usually 20 to 25 years with regular servicing. Without servicing, problems with the valves, expansion vessel and air gap tend to start much sooner.
Yes. Most modern cylinders fit the same space, and I'll make sure the connections and discharge pipework are right for the new one.
Heat pumps need a cylinder with a larger heating coil than a boiler cylinder. If you're moving to a heat pump, I can supply the right heat pump cylinder.
Yes. Unvented cylinders should be serviced every year to keep them safe and keep the warranty valid. My cylinder service is £140.

Get a Price for a New Cylinder

Send me a photo of your current cylinder and its label, and I'll get back to you with a price.

07717 846247
Unvented cylinder in a boarded loft with expansion vessel, T&P valve and insulated pipework
An unvented cylinder in a boarded loft with its expansion vessel, T&P valve and insulated primaries. Orpington.
callCall Gary — 07717 846247