OSO Ecoline 180L Indirect Unvented Cylinder | 1327053 | 3kW Backup

Description

The OSO Ecoline 180L indirect unvented cylinder (SCE 180, part number 1327053) delivers mains-pressure hot water from a stainless steel storage tank heated by a 0.8 m² heat exchanger coil and backed up by a factory-fitted 3 kW immersion heater. It is OSO’s entry-level range, built by a Norwegian manufacturer with the same stainless steel construction as the rest of the OSO line-up.

Standing heat loss is just 1.46 kWh per 24 hours (61 W), the cylinder is 580 mm in diameter and 1160 mm tall, and the inner tank carries a 25-year warranty for private domestic installations. A two-port motorised valve, 18 litre expansion vessel and fittings kit are supplied, so it suits straightforward replacement of an existing cylinder or a new boiler-fed unvented system in homes with up to two bath or shower rooms.

180 L

Nominal capacity

248 L

Hot water at 40°C

1.46 kWh

Standing loss per 24 h

0.8 m²

Heat exchanger coil

3 kW

Immersion backup

25 Year

Tank warranty

Installation and regulations

An unvented cylinder must be installed, commissioned and serviced by a competent person in line with Building Regulations Part G3, the OSO installation manual and the Benchmark commissioning checklist. The safety valve overflow must never be sealed or plugged, and the discharge pipework must be installed to G3 requirements. Annual servicing and an up-to-date logbook are required to keep the warranty valid.

Compatibility

The immersion heater is intended for backup use only; OSO advises against using it as the sole heat source. The cylinder is not suitable for gravity-fed primary systems, and a motorised valve must be fitted in the primary flow (one is supplied). For heat pump systems, choose a dedicated heat pump cylinder with a larger coil.

Sizing guide

OSO’s sizing chart points to the 180 litre size for homes with two bath or shower rooms. The cylinder produces 248 litres of mixed water at 40°C from a single heat-up, so check the bath volume and shower flow rates in the property against that figure before ordering.

Key Features

Coil that heats the whole cylinder

A 0.8 m² stainless coil rated at 16 kW brings the cylinder up to temperature in 34 minutes, with a 24 minute reheat to 70%, so hot water is available quickly after use.

Low standing heat loss

35 mm PUR foam insulation holds standing loss to 1.46 kWh per 24 hours, helping to keep running costs down between heating cycles.

Stainless steel tank and coil

Tank and integrated coil are made from 1.4521 stainless steel with a 25-year tank warranty for private domestic use, plus 2 years on components.

Safety controls factory fitted

Supplied with a temperature and pressure relief valve, 85°C safety cut-out and 6 bar expansion relief. A two-port motorised valve acts as the positive energy cut-out.

Boiler-friendly connections

22 mm coil flow and return on top, S-plan or Y-plan wiring, and compatible with standard thermostat or thermistor (probe) controlled boilers.

Designed for easy installation

Adjustable feet, cable channels in the base, a fully drainable tank and optional VB16 wall bracket for neat, level installation.

What’s Included

Factory fitted: 3 kW immersion heater, thermostats with thermal cut-out, temperature and pressure relief valve.

Supplied for site fitting: 18 litre expansion vessel with wall bracket, fittings kit and two-port motorised valve.

Documentation: installation manual and service logbook.

Specifications

Identification

Brand

OSO Hotwater

Model

Ecoline SCE 180

MPN

1327053

EAN

7070644008284

Type

Indirect unvented, mains-pressure hot water cylinder

ErP class

C

Capacity and Performance

Nominal capacity

180 litres

Actual tank capacity (20°C)

163 litres

Hot water capacity (above 40°C)

248 litres

Standing heat loss

1.46 kWh/24h (61 W)

Coil heat-up time

34 minutes

Coil reheat time (70%)

24 minutes

Primary heating power (coil)

16 kW at 900 l/h primary flow

Coil pressure drop

47 mbar

Immersion heat-up (1 element)

154 minutes

Immersion reheat (70%, 1 element)

108 minutes

Dimensions and Weight

Diameter

580 mm

Height

1160 mm

Weight (gross)

52 kg

Weight when filled

215 kg

Packaging (W x D x H)

595 x 595 x 1185 mm, 55 kg

Service clearance

400 mm in front of immersion cover, 150 mm above highest point

Construction

Tank and coil material

Stainless steel, grade 1.4521

Insulation

PUR foam, 35 mm average thickness

Immersion element material

Incoloy 825

IP rating

IP24

Standards

EN 12897:2016 tank standard, EN 60335-2-21 safety standard, UKCA marked, KIWA Watertec approved

Pressures and Temperatures

Design pressure (cylinder and coil)

10 bar

Operating pressure

3 bar cylinder, 2 bar heating coil

Maximum cylinder temperature

70°C

Maximum coil temperature

99°C (primary flow up to 82°C)

Expansion relief valve

6 bar

Temperature and pressure relief valve

7 bar / 90°C

Maximum supply pressure

12 bar

Recommended supply

2.5 bar minimum standing pressure, 20 l/min at 1 bar dynamic

Expansion vessel

18 litres, 3 bar pre-charge

Connections

Coil flow and return

22 mm

Cold water inlet

22 mm

Hot water outlet

22 mm

Immersion heater boss

5/4 inch

Temperature and pressure relief valve

1/2 inch

Secondary return

No dedicated tapping; connect via a tee in the cold feed

Electrical

Supply

230 V / 50 Hz single phase

Immersion heater

3.0 kW at 240 V (2.8 kW at 230 V)

Thermostat range

40°C to 70°C, factory set to 60°C

Safety thermal cut-out

85°C

Supply requirement

Dedicated permanent supply, minimum 16 A, with 20 A double-pole isolator

Warranty

Stainless steel tank

25 years (private domestic installations, subject to OSO conditions)

Components

2 years

Frequently Asked Questions

What size home is the 180 litre Ecoline suitable for?

OSO’s sizing chart recommends the 180 litre size for homes with two bath or shower rooms. It delivers 248 litres of mixed water at 40°C. For large baths, power showers or very high flow rates, OSO advises that a larger size may be needed.

Is a motorised valve supplied?

Yes. A two-port motorised valve is supplied. It acts as the positive energy cut-out required on indirect unvented cylinders and can be wired into an S-plan or Y-plan system.

Can I use this cylinder with a heat pump?

The Ecoline SCE has a 0.8 m² coil suited to boiler-type primary sources. For heat pump installations, OSO offers dedicated heat pump cylinders with larger coils, so choose one of those instead.

What do I need to supply for installation?

The expansion vessel, fittings kit and motorised valve are supplied. You will need a tundish and discharge pipework installed to Part G3 (22 mm pipework with a continuous fall, maximum 9 m straight run), a drain cock on the cold supply, and a dedicated electrical supply to the immersion heater.

Can I fit a secondary return?

There is no dedicated secondary return tapping on the Ecoline SCE. A secondary return can be connected through a tee piece in the cold feed after the multibloc valve. Fit a timer to the circulation pump and a non-return valve between the pump and the cylinder.

How is the 25-year warranty validated?

The 25-year cover applies to the stainless steel tank in private domestic installations. It requires installation by a professional installer, a completed commissioning checklist, annual servicing recorded in the logbook, and water within OSO’s stated quality limits. The immersion heater should not be exposed to water harder than 10°dH.

Can the cylinder be wall mounted?

Yes. The optional VB16 wall bracket is available for the Ecoline SCE 120 to 180 litre sizes. The wall must be able to carry the full weight of the filled cylinder, which is 215 kg for the 180 litre model.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

Calculate

Required Heating

0

Watts

0

BTUs