The Main 150 Litre Indirect Unvented Hot Water Cylinder (5133562) is a UK-manufactured, stainless steel cylinder designed to deliver mains-pressure hot water heated indirectly by a gas, oil, or system boiler. With a factory-fitted Incoloy 800 immersion heater as backup, this 150L cylinder suits small to medium homes with one or two bathrooms requiring fast, reliable hot water delivery.

At Getplumb, we offer the best trade prices on the full Main unvented cylinder range — backed by a 25-year warranty on the stainless steel inner vessel and a one-year parts and labour warranty.

The unique coil-in-coil heat exchanger delivers rapid heat recovery, while 50mm of factory-injected polyurethane foam minimises heat loss. KIWA approved for compliance with Water Regulations and Building Regulation G3. Supplied with a 2-port motorised valve for primary over-temperature protection.

Key Features:

• Capacity: 150 litres indirect unvented hot water
• Primary Coil: 22mm stainless steel coil-in-coil heat exchanger, 12.5kW rating
• Immersion Heater: 1 × 3.0kW Incoloy 800 alloy element @ 240V (backup)
• Inner Vessel: high-grade stainless steel, 15 bar pressure tested
• Insulation: 50mm CFC/HCFC-free polyurethane foam
• Operating Pressure: 3.5 bar
• Maximum Flow Rate: up to 55 l/min @ 6 bar
• Thermostat: adjustable 10–70°C with 80°C high-limit
• Connections: 22mm compression / ¾" BSP
• Supplied with: 12 litre expansion vessel, T&P relief valve, 2-port motorised valve, pressure reducing valve, factory-fitted controls
• Approvals: KIWA approved, Building Regulation G3 compliant, CE marked
• Manufactured: in the UK by Baxi (Main Heating)
• Warranty: 25 years on stainless steel inner vessel, plus 1 year parts & labour

Specification Table:

Pairs perfectly with the Main Eco Compact System or Main Eco Elite System boilers for a complete domestic hot water solution.

Order online for UK delivery or collect from our Reading trade counter.

At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.

🆓 Free Local Delivery (Orders £60 & above)

We offer FREE delivery on orders £60 or more for selected local areas.

Eligible Postcodes Include:

• RG*
• SL*
• OX10*, OX11*, OX49*
• HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
• WD*, HA*, UB*, TW*, KT*
• W1* – W9*
• NW*, SW*

Delivery Time: 2–4 working days
Shipping Cost: £0.00

📦 Standard Shipping (Weight-Based Rates)

For orders that do not qualify for free delivery, standard shipping rates apply based on total cart weight.

• For cart weight between 0–5 kg, the shipping cost is £2.99 with a delivery time of 2–4 working days.
• For cart weight between 5–25 kg, the shipping cost is £7.99 with a delivery time of 2–4 working days.
• For cart weight between 26–40 kg, the shipping cost is £15.98 with a delivery time of 2–4 working days.
• For cart weight of 41 kg and above, the shipping cost is £31.96 with a delivery time of 2–4 working days.

🧱 Block Salt (Harvey’s) – Unit-Based
Shipping

This rate applies only to Harvey’s block salt products.

• £7.99 is charged for every 3 items.
• The charge increases by £7.99 for each additional set of 3 items.

Examples:

• 1–3 items → £7.99
• 4–6 items → £15.98
• 7–9 items → £23.97

Delivery Time: 2–4 working days

📏 Large / Long Items (Length-Based Shipping)

For oversized items where the product length is 1.5 metres or more:

Conditions:

• Product length ≥ 1.5 m
• Cart weight ≤ 40 kg

Shipping Cost: £18.00 (flat rate)
Delivery Time: 2–4 working days

Collection from Store

Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge.

For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.