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G4 Prime

  • Central Heating
  • Plumber


Giedrius (Geds) Nevulis

Call07488 824982

Skills & expertise

  • Central Heating
    • Emergency Central Heating Repair
    • Gas Boiler Installation
    • Gas Boiler Servicing / Repair
    • Gas Central Heating Installation
    • Gas Central Heating Servicing / Repair
    • Gas Cooker Installation
    • Gas Safety Checks - CP12
    • Smart Thermostats
  • Plumber
    • Bathroom & Kitchen Plumbing
    • General Plumbing
    • Plumbing Repairs
    • Power Flushing
    • Radiator Installation
    • Radiator Repair
    • Radiator Thermostat Valve Installation
    • Radiator Thermostat Valve Repair
    • Shower Installation
    • Shower Repair
    • Tap Repair
    • Underfloor Heating Installation
    • Underfloor Heating Repair
    • Unvented Hot Water Cylinder Installation
    • Unvented Hot Water Cylinder Servicing / Repair
    • Water Leak Detection
    • Water Pumps Installation
    • Water Pumps Repair

Company info

Hi, I'm Giedrius

I am your local gas engineer and plumber. I am based in Brentwood and I serve - RM - and - CM - post codes. I install, repair and maintain all aspects of domestic plumbing and heating. Hire me and you will get your job done quickly and professionally.

I have over 10 years experience in installation, repair and maintenance of domestic plumbing and heating systems. I specialize in efficient central heating and hot water installation using: gas condensing boilers, unvented and vented hot water cylinders, calculated and sized pipework and emitters for radiators and underfloor heating.

Please explore this website for more information on how I can help you design, install, maintain or improve your heating and hot water system regardless if it is powered by a gas boiler, heat pump or an electric boiler.


 Boiler installation

Do you need a new high efficiency condensing boiler supplied and fitted? Are you looking for local & cost effective boiler installation engineer?

Quality Boiler Installation

Value For Money

Piece of Mind

Long Warranties – All work comes with 24 months workmanship warranty, in addition - manufacturers warranty up to 10 years.


General plumbing

I offer general plumbing services. Charged per first started hour followed by half an hour increments. This service covers all your domestic plumbing needs: water leaks, replacing taps, showers, basins, WC, installation of washing machines, dishwashers, tumble dryers, garden taps, etc.

General plumbing first hour booking

For all your general plumbing requirements: fixing leaks, installing taps, showers, basins, washing machines, dishwashers, etc. Booking fee covers first hour of service excluding materials and parking


Emergency Plumbing

For all your emergency plumbing needs please call us


Unvented Cylinder installation, service and repair

I offer installation, servicing and repair to unvented and vented hot water storage system & cylinders . I hold all required qualification for installation and servicing of hot water systems (G3 qualification). Please get in touch for a free, no obligation quote on new installations. Repairs and servicing is charged at hourly rates.


Central heating power flush / Magna cleanse

We using latest Kamco technology Clearflow® CF40 and Adey MagnaCleanse

Power flushing on site consultation and system pre treatment –

Site visit to confirm if power flush to your central heating system is required. Test system water for corrosion, PH and presence of inhibitors. Provide written report with test results and power flush recommendation. If power flush is recommended, we will pre-treat your system at the time of visit.

We offer competitive pricing based on hourly charges for repairs and emergency plumbing and fixed pricing for Gas Safety inspections, servicing and installations.

We provide free quotes on gas and plumbing installations. Book your free quote online or get in touch through contact section.

Contact details

Reviews Summary

Average score based on 25 reviews in the last 12 months
56 Total Reviews

The reviews below represent customers' views and not the views of Checkatrade

Quote Accuracy
(23 Reviews)

Customer Reviews


Under floor heating repair

Verified Review

Life saver!! Messaged a few companies at 6am on route to work and he was first to respond half hour later, come round before his first job and back the next day to finish. Will be using again and can see why he’s the top rated guy on here!

Location: CM13
Reviewed in: March 2023

Installing new unvented cylinder.

Verified Review

Professional, no time wasted, neat job!

Location: CM2
Reviewed in: February 2023

Boiler installation

Verified Review

Gierdrius supplied and installed our new ideal logic combo boiler. Giedrius was punctual and very professional from the get go. He not only explained the work being done in detail but provided accurate quotes from the start and I am very happy with his service.

Location: RM12
Reviewed in: January 2023

Replace leaking expansion vessels of unvented system.

Giedrius was honest and professional in his advise of current hot water system and fixed the problem without issue.

Location: RM3
Reviewed in: January 2023

Quick repair, good price

Verified Review

Very good service, found the issue quickly and fixed it. Reasonable prices also.

Location: DA1
Reviewed in: January 2023

Hive installation, boiler servicing, power flush

Verified Review

Arrived on time, very efficient and professional Did a thorough job and would highly recommend.

Location: CM14
Reviewed in: December 2022


  • Domestic Work
  • Commercial Work
  • Free Estimates (excl. Insurance)
  • 24 Hour Call-out
  • Insurance Work Undertaken
  • Cards Accepted


Works in

RM and west side CM postcodes

Vetting Status

Fully Vetted Trade

Self Certified
Company Type
Ltd Company
Checkatrade T&Cs
Approved member since 2021
Trading address verified
ID Checked
Checkatrade Standards
Company Status
Limited Company Checked
Yes: Registered as a Company G4 Prime Ltd No: 
VAT Registered
Yes: 406 2419 24
Company Type
Ltd Company
Business Owners
Agne Pilaciauskaite
Insurance Details
Public Liability Insurance
Current: Self-Certified on: 09/11/2022
Insured By
Simply Business

Accreditations and Memberships





bpec Certification Ltd - Unvented Hot Water

bpec Certification Ltd - Unvented Hot Water

Logic4Training in the following: Working at Heights, Manual Handling, Basic Legionella Management, Working Safely, Basic Fire Safety Awareness, Asbestos Awareness

LCL Award in Hot Water Systems & Safety

UKAS - LCL Awards:

CCN1 - Core Domestic Gas Safety - NG

CPA1 - Combustion Performance Analysis

CENWAT - Central Heating Boilers & Water Heaters

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