Worcester Greenstar 8000+ 36kW Gas Combi Boiler - GR8701iW 36 C NG - 7736702579

Description

The Worcester Greenstar 8000+ 36kW Combi Boiler (model GR8701iW 36 C NG, part number 7736702579) is the manufacturer's flagship gas condensing combi, built for the largest family homes with multiple bathrooms and high simultaneous demand for heating and hot water. It delivers a 33.7kW central heating output and a domestic hot water flow rate of 13.5 litres per minute at 40°C rise, comfortably supporting busy mornings across bigger households.

Control is handled through a full-colour touchscreen display with backlit touch buttons, and the boiler connects wirelessly to Bosch EasyControl for remote heating management. An ErP A rating for both space heating and water heating keeps running costs down, while a seasonal space heating efficiency of 94% reflects Worcester Bosch's condensing heat exchanger design. The 8000+ range comes with rear piping, a pre-plumbing jig, and an optional Intelligent Filling System that keeps system pressure maintained automatically.

36 kW

Max DHW Output

33.7 kW

CH Output

13.5 L/min

DHW Flow Rate (40°C ΔT)

94%

Seasonal Space Heating Efficiency

A / A

ErP Rating (Space / Water)

Up to 12yr

Guarantee

Gas Safe Registered Installation Required

This appliance must be installed, commissioned and serviced only by a Gas Safe registered engineer, in accordance with current Gas Safety (Installation and Use) Regulations and the manufacturer's installation and servicing instructions. Incorrect installation could lead to prosecution.

Guarantee Length Depends on Installation

The Greenstar 8000+ comes with an 8-year guarantee as standard, extending to 10 years when installed with any Greenstar System Filter, and up to the full 12 years when installed by a member of the Worcester Bosch Loyalty Programme. Terms and conditions apply - confirm eligibility with the installer before purchase.

Automatic System Pressure Management

The 8000+ supports Worcester Bosch's optional Intelligent Filling System, which can automatically top up and maintain the correct system pressure, reducing the need for manual re-pressurising and helping to protect the heating system from the effects of frequent pressure loss.

Full-Colour Touchscreen Control

An interactive touchscreen display with backlit touch buttons makes adjusting temperature, hot water and settings straightforward for both homeowners and installers.

Wireless Smart Control Ready

Connects wirelessly to Bosch EasyControl for weather-responsive heating and remote management from a smartphone, helping make day-to-day heating more efficient.

High Central Heating Efficiency

Delivers a 94% seasonal space heating efficiency rating, backed by an ErP A rating for both space and water heating, to help keep energy bills in check.

Built for Larger Households

With a 36kW DHW output and 13.5 L/min flow rate at 40°C rise, this model is sized for bigger homes with multiple bathrooms and simultaneous hot water demand.

Simplified Installation

Supplied with rear piping, a pre-plumbing jig, and a fixing pack, designed to reduce on-site installation time and complexity for the installer.

Frost Protection Built In

Integrated frost protection helps guard the boiler and heating system against freezing conditions when the property is left unoccupied or during cold snaps.

General

Model

GR8701iW 36 C NG

Manufacturer Part Number (MPN)

7736702579

GTIN / Barcode

4069143014240

Boiler Type

Gas fired condensing combi boiler

Fuel Type

Natural Gas

Mounting

Wall mounted

Colour

White

Dimensions (H x W x D)

780 x 440 x 365 mm

Performance

Rated Heat Output

34 kW

Central Heating Output

33.7 kW

Domestic Hot Water Output (Max)

36 kW

Domestic Hot Water Output (Min)

5.1 kW

Hot Water Flow Rate (40°C ΔT)

13.5 L/min

Central Heating Condensing Max Output

35 kW

Efficiency & Emissions

ErP Efficiency Rating - Space Heating

A

ErP Efficiency Rating - Water Heating

A

Seasonal Space Heating Efficiency

94%

Water Heating Efficiency

87%

NOx Emissions

25 mg/kWh (NOx Class 6)

Sound Power Level (Indoors)

53 dB

Controls & Connectivity

Display

Full-colour touchscreen with backlit touch buttons

Smart Control Compatibility

Bosch EasyControl (wireless)

Solar Compatible

No

Intelligent Filling System

Optional accessory - automatic pressure maintenance

Guarantee

Standard Guarantee

8 years

With Greenstar System Filter

10 years

Via Worcester Bosch Loyalty Programme Installer

Up to 12 years

What's in the Box

Supplied as a wall-mounted gas condensing combi boiler with mounting bracket, mounting plate with Keyless Filling Link pre-installed, PRV discharge pipe and mounting bracket, fixing pack, bottom cover, guarantee card and product documentation. Flues, controls and the Greenstar System Filter are sold separately.

What size property is the 36kW Greenstar 8000+ suitable for?

This model is designed for larger family homes with two or more bathrooms, where several hot water outlets may be used at the same time. Its 36kW DHW output and 13.5 L/min flow rate at 40°C rise support higher simultaneous demand than smaller combi models.

Does this boiler come with a hot water cylinder?

No. As a combi boiler, it heats water on demand directly from the mains and does not require a separate hot water cylinder or cold water storage tank.

How long is the guarantee on this boiler?

It carries an 8-year guarantee as standard, extending to 10 years when installed with a Greenstar System Filter, and up to 12 years when installed by a Worcester Bosch Loyalty Programme member. Terms and conditions apply.

Can this boiler be controlled remotely?

Yes. The Greenstar 8000+ connects wirelessly to Bosch EasyControl, allowing heating to be managed and monitored remotely via smartphone, alongside weather-compensated control for improved efficiency.

Is a system filter required with this boiler?

A system filter is not required for the boiler to operate, but Worcester Bosch strongly recommends fitting a Greenstar System Filter to protect the heat exchanger from system debris, and doing so also extends the standard guarantee from 8 to 10 years.

Who can install this boiler?

Installation, commissioning and servicing must be carried out by a Gas Safe registered engineer, in accordance with current UK gas safety regulations and the manufacturer's installation instructions.

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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)

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