210L Megaflo replaces a noisy gravity tank
A sandstone cottage in Brampton: old copper cylinder and loft tank out, a 210L Heatrae Sadia Megaflo in, with copper G3 discharge to a safe gully.
- Area
- Brampton · CA8 1
- On site
- 1 day
- Price paid
- £1,890
- FittedFrom £1,650
- Yearly service£95 fixed
- QualifiedBPEC G3 Certified
- AreaCarlisle to Keswick
Strong Mains-Pressure Hot Showers in Every Bathroom at Once. Unvented hot water cylinders, fitted from £1,650.
Two showers running at full pressure at the same time, the noisy loft tank gone, and one fixed fitted price. Mark sizes, fits and safety-checks Heatrae Sadia Megaflo and Santon unvented cylinders himself, as a BPEC G3-qualified plumber.
Mark's mobile rings firstSurveys & installations Mon–Fri 8am–6pm, Sat 9am–1pm · Emergency leaks & cylinder call-outs 7 days, 8am–8pm
Boiler swap needed too? Our partner Gas Safe heating engineer does the gas side on the same quote.
- 3.0 barSteady pressure at every tap
- 22 L/minEnough for two showers at once (210L)
- £1,650Fitted price, from
What you'll notice
- Showers
- Full pressure, two at once
- Loft tank
- Gone
- Safety
- Checked yearly · BPEC G3
01 — Size it in ten seconds
Pick a size. See the flow, recovery and fixed price.
Choose the cylinder closest to your home. Mark confirms the size free with a mains flow and pressure test before anything is ordered.
Capacity
210 litres
From £1,890
Fixed fitted price · labour, materials & waste removal included
Book a free flow test for a 210L- Recommended bathrooms
- 2–3 · Most Chosen
- Balanced flow rate
- 22 L/min
- Indirect coil recovery
- 23 mins
- Expansion vessel
- 25L White Potable Expansion Vessel
Every fitted price includes
- Inlet control group: strainer, pressure-reducing valve, check valve & expansion relief valve
- White potable expansion vessel, sized to the cylinder
- T&P relief valve, thermal cut-out & cylinder thermostat
- Tundish and copper D1 / D2 discharge to Building Regulations G3
- 2-port zone valve, connected to your existing boiler controls
- Draining down and removal of the old cylinder and loft tank
- Commissioning, Benchmark record & warranty registration
Not included: boiler or gas work (quoted separately by our partner Gas Safe heating engineer) · water-company upgrades beyond your stopcock · redecorating the cupboard.
02 — Why it's safe
Five safety parts, checked every year, so you never have to think about them.
Tap a part to see what it does in plain English, and what Mark checks when he fits it.
Component 01 · Inlet control
Steady pressure at every tap, with no scalding surges
The Caleffi PRV and line strainer sit on the incoming main and hold the cylinder at a steady 3.0 bar. The cold take-off comes from the PRV's balanced port, so hot and cold reach every mixer at the same pressure, with no scalding surge when someone flushes.
- Set pressure
- 3.0 bar
- Supply
- 25mm MDPE / 22mm Cu
- Strainer
- Cleaned every service
Component 02 · Expansion
Room for hot water to expand, safely
Water expands as it heats, and the vessel takes up that extra volume so the pressure stays in range. It must be a white, WRAS-approved potable vessel with a butyl diaphragm. Red vessels are built for central-heating water, not water you drink or wash in. A 6 bar expansion relief valve is the back-up.
- Type
- WRAS potable · butyl
- Pre-charge
- 3.0 bar = PRV set
- Sizes
- 18L · 25L · 35L
Component 03 · Over-temperature
The cylinder can never boil
The last line of the G3 safety cascade. The control thermostat holds 60–65°C, a non-self-resetting thermal cut-out sits behind it, and if both ever failed the top-mounted T&P valve opens at 95°C and discharges before the water can boil.
- Opens at
- 95°C
- Thermostat
- 60–65°C
- Tested
- Every annual service
Component 04 · Discharge (D1)
An early warning you can see
Anything the safety valves release runs through 15mm D1 pipe into a tundish within 600mm of the valve, fitted where you can see it. The air break stops dirty water being drawn back, and water in the tundish is your early warning to call us.
- D1 pipe
- 15mm
- Distance
- ≤ 600mm to tundish
- Position
- Visible, accessible
Component 05 · Discharge (D2)
Hot water released safely outside
From the tundish, 22mm copper drops at least 300mm vertically, then runs on a continuous fall to a safe, visible discharge point at a gully. Copper, because the water it carries could be close to boiling.
- Pipe
- 22mm copper
- Vertical drop
- ≥ 300mm
- Ends at
- Safe gully
Fitting an unvented cylinder is notifiable work under Building Regulations Part G3. Mark holds BPEC G3 certification and leaves the Benchmark commissioning record in your handover folder.
03 — Gravity vs mains pressure
From a gravity-tank dribble to full mains pressure.
Many older Cumbrian homes still run hot water from a tank in the loft. An unvented cylinder runs straight off the mains instead.
Gravity header tank
0.3 Bar / 6 L/min
Pressure
Flow
Mains-pressure unvented Megaflo
3.0 Bar / 22 L/min
Pressure
Flow
| Gravity tank | Unvented Megaflo | |
|---|---|---|
| Pressure at the shower | 0.3 bar, from the height of the loft tank | 3.0 bar, balanced hot and cold |
| Flow | 6 L/min | 22 L/min (210L) |
| Two showers at once | The second one drops to a trickle | Both at full mains pressure |
| Loft tank | Cold-water tank in the loft | Removed, loft space back |
| Shower pump | Often needed for a usable shower | Not needed |
| Safety & servicing | Vented, open to the loft tank | G3 safety chain, £95 annual service |
Weak incoming main? Mark measures your pressure and flow at the stopcock on the free survey. If it falls short, a Stuart Turner Monsoon booster pump, from £480, is the better answer, and we'll tell you so.
04 — Van-stock repairs
Shower and plumbing repairs, priced before we arrive.
Mark carries the common cartridges, valves and seals on the van, so most repairs are finished on the first visit. Prices include labour, materials and waste removal.
-
01
Shower Repairs & Mixer Replacements
Mira, Aqualisa, Triton, Bristan and Grohe cartridges and solenoids on the van.
Book a shower repair →From£115
-
02
Tap, Toilet & Radiator Replacements
Geberit and Grohe flush valves, ceramic disc cartridges and TRVs.
Get a fixed price →From£95
-
03
Burst Pipes, Leaks & Seized Stopcocks
Trace-and-access on weeping joints, leaking waste traps and stopcocks that won't turn.
Same £95, 7 days, 8am–8pm
How the £95 thermal leak diagnosis works →£95Fixed diagnosis
-
04
Annual G3 Unvented Cylinder Safety Service
BPEC G3 strainer clean, expansion vessel pre-charge and T&P relief test, logged in your Benchmark record.
Book a G3 service →£95Fixed service
For leaks, the repair price is confirmed before any further work.
05 — Local work
A new cylinder in Brampton, a Sunday repair in Dalston.
Both finished for exactly the price quoted. Tap either job for the full breakdown.
Sunday shower failure, fixed Monday
A Mira digital shower stopped on a Sunday afternoon. Mark arrived Monday morning with the exact cartridge on the van.
- Area
- Dalston · CA5 7
- On site
- 45 mins
- Price paid
- £115
Guest house or holiday let with three bathrooms? See 250L–300L cylinders in Keswick → · Oil boiler or heat pump? See cylinders in Brampton & the Tyne Valley → · Low pressure in a sandstone terrace? See Penrith →
★★★★★
03 Aug 2026 · Google
“Replaced a noisy gravity tank in our Brampton sandstone cottage with a 210L Heatrae Sadia Megaflo unvented cylinder. For the first time in 12 years both showers run at full mains pressure at the same time. Neat copper pipework.”
Richard Armstrong
Brampton (CA8)
Which cylinder size do I need?
A 170L cylinder suits 1–2 bathrooms, 210L suits 2–3 and 250L suits 3–4. Mark confirms the size free with a mains flow and pressure test before anything is ordered.
What if my mains pressure is too low for an unvented cylinder?
Mark tests your incoming pressure and flow on the free survey. If it falls short, a Stuart Turner Monsoon booster pump, from £480, is the better answer, and we'll tell you so.
Why does the expansion vessel have to be white?
White vessels are potable: WRAS-approved with a butyl diaphragm rated for drinking water. Red vessels are made for central-heating water and must never be fitted on an unvented hot water system.
I have a combi boiler. Do I need a cylinder?
Usually not. A combi heats water on demand. Cylinders suit homes with two or more bathrooms, or with a system or regular boiler.
Does an unvented cylinder need servicing?
Yes, once a year, to keep the manufacturer warranty valid. Our annual G3 safety service is a fixed £95: strainer clean, expansion vessel pre-charge check and T&P relief valve test.
Can you do boiler or gas work too?
We handle all bathrooms, wetrooms, unvented hot-water cylinders (G3) and plumbing leaks in-house, and partner with our dedicated Gas Safe heating engineer whenever a job includes a boiler swap or gas pipework. You still deal with one person, Mark, and get one written quote.
When can I reach you?
Surveys & installations: Mon–Fri 8am–6pm, Sat 9am–1pm. Emergency leaks & cylinder call-outs: 7 days, 8am–8pm. Mark's mobile rings first. Only if he's under a floor or soldering pipework does reception take your postcode and job details, so Mark can ring you back between jobs.
07 — Free flow & pressure test
Find out if your home is ready for mains pressure.
A free flow and pressure test at your stopcock tells Mark which cylinder suits your home, or whether a booster pump is the better answer.
Mark's mobile rings first · Emergency leaks & cylinder call-outs 7 days, 8am–8pm