Vaillant Advance Installer
Manufacturer training supports accurate specification and commissioning. Qualifying installations may carry protection up to 10 years, depending on the eligible model, installation and registration conditions.
Boiler engineering for Hampstead and NW3
Boiler Installation Hampstead.
Correctly sized boiler replacement, full-system cleaning and measured Gas Safe commissioning — delivered as one complete installation.
Earliest installation appointments may be available from 48 hours, subject to survey, product stock and engineer availability.
16Years serving London homes
48hEarliest available slots*
FullPowerFlush every time
7–12Year protection options†
Installer credentials
Manufacturer training. Gas registration you can verify.
Boiler choice is only half the job. Correct sizing, hydraulic design, water quality and recorded commissioning determine how the system performs after handover.
Viessmann Trained Installer
Product training informs appliance selection, system preparation and handover. Qualifying installations may carry 7, 10 or up to 12 years’ protection, subject to the selected product and current programme.
Gas Safe No. 520933
Pure Energy Project Ltd is a Gas Safe registered business. Our registration gives clients a clear business number to verify before gas work begins.
Protection periods depend on brand, model, qualifying accessories, the manufacturer programme in force and ongoing servicing conditions. The exact term offered is stated in your quotation.
Clean system water is part of the job
A new boiler should not inherit the old circuit’s contamination.
Existing heating circuits can carry magnetite, sludge and installation debris. Connecting a new heat exchanger to contaminated system water can restrict circulation, create noise and place avoidable stress on components.
PEP includes a complete PowerFlush before commissioning. The system is cleaned, protected and checked as one installation — not treated as an optional extra after the quotation.
- Full heating circuit cleaned before the new appliance is brought online
- Suitable magnetic protection fitted to capture circulating debris
- Fresh inhibitor introduced and water condition checked at handover
Complete boiler replacement
Every technical decision is made before commissioning.
The survey and quotation define the boiler, gas and flue requirements, controls, system cleaning and handover. Essential work is included in one agreed installation scope.
Heat and hot-water demand
We assess calculated heating demand, hot-water requirements and existing zones before deciding output and storage.
Gas supply and flue route
The available gas pipe, proposed flue terminal, clearances, ventilation and condensate route are checked before price is fixed.
Hydraulic arrangement
Boiler type, cylinder, pumps, valves and zoning are considered as one system rather than separate product choices.
Water quality and protection
The full-system PowerFlush, magnetic protection and inhibitor are included within the replacement scope.
Compatible heating controls
Programmers, thermostats and compensation controls are selected for compatibility, then configured during commissioning.
Measured commissioning
Gas rate, combustion, working pressure, temperatures and safety functions are tested and recorded before handover.
Built around demand
The right boiler depends on storage, flow and space.
A large output figure does not solve a poor system arrangement. We select the boiler type after the survey confirms water flow, hot-water use, available plant space and the condition of the existing heating circuit.
Combination boiler
Can suit systems where incoming water flow, gas supply and simultaneous hot-water demand support the chosen model.
System boiler
Often the stronger arrangement where a correctly sized cylinder is required to provide dependable stored hot water.
Regular boiler
May remain appropriate where a compatible traditional system is sound. Tanks, cylinder and controls are altered only when the survey identifies a clear benefit.
Recorded commissioning
The installation is complete only when operation is proved.
The appliance is tested under operating conditions. Combustion, gas rate, working pressure, temperatures and safety functions are checked and recorded rather than assumed.
Controls are demonstrated, documents are completed and the applicable Gas Safe and manufacturer registrations are submitted after handover.
Flue-gas analysisGas-rate verificationControls walkthroughRegistered handover
One agreed scope
From first photographs to registered handover.
Each stage closes a technical uncertainty: what is installed, what output is required, how the system will be cleaned and how correct operation will be proved.
Discover
Photographs and a short conversation establish the likely route. A survey confirms demand, gas supply, flue, condensate, controls and system configuration.
Design
We specify boiler type, output, controls, system protection and required alterations, then issue one written scope for the complete installation.
Prepare
The old appliance is removed, agreed alterations are completed and the whole heating circuit receives its included PowerFlush.
Prove
The appliance is commissioned, readings are recorded, controls are explained and the required Gas Safe and qualifying manufacturer registrations are completed.
Manufacturer protection
The applicable protection period is written into the quotation.
PEP matches the available term to the selected boiler, qualifying accessories and manufacturer programme in force at the time of installation.
Manufacturer-backed protection is included where the proposed product and current conditions qualify. It is never assumed across every model, and scheduled servicing requirements continue to apply.
†Eligibility varies by brand, model, accessories and current promotion. Manufacturer terms, registration deadlines and servicing conditions apply. Your quotation states the exact cover offered.
Need the likely route quickly?
Planning a boiler replacement in Hampstead?
Send the NW3 postcode, photographs of the boiler, pipework and flue, the current model, and details of any cylinder or tanks. We will confirm the next technical step and whether a survey is required.
Hampstead boiler questions
Practical answers before the survey.
If the heating arrangement is unusual or the required performance is unclear, talk it through with the PEP team before booking.
01How do you choose the correct replacement boiler size?+
We assess heating demand, hot-water requirements, existing system configuration, gas supply and controls. The old boiler rating is evidence, not an automatic specification for the replacement.
02Is a full PowerFlush included with a PEP boiler replacement in Hampstead?+
Yes. A full-system PowerFlush is included before the new boiler is commissioned. We clean the existing circuit, fit suitable magnetic protection, introduce fresh inhibitor and check the condition of the system water before handover.
03When is a combination boiler the correct choice?+
A combination boiler is suitable only when incoming water flow, available gas supply and simultaneous hot-water demand support it. Otherwise, a system boiler with correctly sized storage may be the better arrangement.
04How long does a boiler replacement normally take?+
A straightforward replacement may be completed within a day. Changes to gas pipework, flue, condensate, controls or system configuration take longer; the expected programme is confirmed after survey.
05Will you check the existing gas pipe, flue and condensate route?+
Yes. The survey checks the available gas supply, proposed flue position and terminal clearances, ventilation where relevant, condensate disposal and the practical route for any required alterations. Those works are stated in the written quotation.
06Do you install Vaillant and Viessmann boilers in Hampstead?+
PEP works with Vaillant and Viessmann products and holds the installer status shown on this page. The proposed make and model are selected for required output, system arrangement and available manufacturer protection.
07What should I send for an initial Hampstead boiler assessment?+
Send the NW3 postcode, clear photographs of the boiler, pipework and flue, the current model, details of any cylinder or tanks and your preferred timing. We will confirm whether a survey is required before quotation.
Explore the wider PEP heating service.