Electric System Boilers

Flexible heating for a renewable future

Range rateable heating and hot water to match property requirements

Easy to install

Minimal servicing & repairs

Flexible sighting – No flue required

Works with existing radiators

Power modulates from 2kW to full power using less energy

Almost 100% efficient

Indirect Cylinders

Primus Flex Electric System Boiler: Efficient, Future-Ready Heating

The Primus Flex electric system boiler is a smart, energy-efficient solution for homes with wet central heating or underfloor heating. Designed as a direct replacement for gas system boilers, it seamlessly integrates with existing radiators and pipework, eliminating the need for costly modifications.

When paired with an unvented indirect hot water cylinder, it delivers reliable hot water for larger homes and multi-bathroom properties. By integrating a timer, homeowners can take advantage of cheaper off-peak electricity, reducing costs while supporting a balanced, renewable-powered grid. With zero emissions, quiet operation, and flexible installation, the Primus Flex system boiler is the smart choice for modern, sustainable heating.

Pre-wired for ease of installation

Suitable for use with vented and unvented cylinders

Integrated pump and expansion vessel

Zero risk of carbon monoxide emission or gas leak

No flue is required

Range rateable heating and hot water to match property
requirements

Near silent in operation

Minimal moving parts

Minimal servicing required

Flexible siting as no flue is required and it’s very compact in size

Ideal for flats and properties with low heat loss, no access to gas,
and high hot water demand

Ability to use low cost and 100% renewable tariffs

Recommended to be used with RF or WIFI programmable thermostats

Ideal for integration with solar PV system when used with a cylinder

Flex Electric System Boilers

Available in 7Kw, 14Kw or 24Kw

Indirect Cylinders
Indirect Cylinders

Electric System Boiler Schematic

Indirect Cylinders

Electric Combi Fitters Kit

Everything you need to get the job done

We put this kit together so you have the right parts at the right time for the right price

Sentinal Vortex 250Magnetic filter 

Sentinal X300 System Cleaner

Sentinal X100 Inhibitor

EPH Combi Pack 4

WRAS Approved Filling Loop

Automatic Bypass Valve

2 x 1/2″ & 2 x 3/4″ Isolation Valves

Caleffi Flow valve 5ltr/min

Installation Guides

Register as an installer to gain access installation & set up guides

At EHS we recognise the growing demand for eco-friendly heating and hot water solutions.

Electric combi boilers can be run from electricity produced from renewable resources such as wind or solar power, which means that you can run your boiler completely free of CO2 emissions.

Moving to electricity is easy, as you don’t need to replace any of your existing pipework or radiators.

By 2050 the UK Government are aiming to generate 100% emission-free electricity. Electric Heating will be a major facilitator in reaching this goal, and in 2020 the Government pledged 40GW of wind-generated electricity in the UK by 2030. This is enough electricity to power every household in the UK!

Electricity prices are currently 3 times more than gas, but as gas is phased out and electricity becomes the fuel of choice, prices per unit of energy are likely to reach parity in the not-too-distant future, and as an electric boiler is 98% efficient, it will be cheaper to run.

By moving to electric heating with a renewable energy tariff, you’ll not only be moving to carbon-free heating but doing your bit for a renewable future!