07956 994429 020 8244 0912 INFO@DHPLUMBING.CO.UK GAS SAFE REGISTERED#180521 AboutServices Service Areas Our WorkReviewsContact 07956 994429020 8244 0912 Request EstimateQuote - Home - Services - Central Heating Installation Gas Safe #1805214.9★ · 159 Google reviews30+ years local # Central Heating Installation inWoolwich & Greenwich System Designed, Fitted and Balanced Properly A complete central heating system designed around your home, from heat loss calculation and boiler sizing through radiators, zoning, controls and commissioning. One team, one accountable install, warrantied in writing. Request a free estimate Call 07956 994429 Call 020 8244 0912 Free heat-loss survey · Written system design 30+ yrs Local experience 180521 Gas Safe registered 4.9★ 159 Google reviews £5m Public liability insured 9–9 Office, 7 days a week Overview ## Central heating designed on paper before it's fitted Central heating done well is quiet, cheap to run and disappears into the background of your life. Done badly it never leaves you alone. What it isA full central heating installation covers boiler selection and sizing, radiator specification, pipework layout, pump and valve arrangement (S-plan or Y-plan), controls, zoning, commissioning and system balancing. Who it's forHomes with a failing or condemned system, extensions being added, older gravity systems being modernised, or new builds and full renovations across SE London. When you need itWhen your existing system can no longer meet demand, when pipework corrodes beyond repair, when a home extension changes the heat demand, or when a rental property needs a full compliant system for letting. Why a professional mattersSystem design is where most heating installations fail before they're even started. Undersized pipework, wrong pump duty, missing zones and non-compliant controls create cold rooms, high bills and Boiler Plus non-compliance from day one. What’s at stake ## What a badly designed system costs over 10 years Cheap heating design is a decade-long tax on your gas bill. ### Undersized boiler Boiler flat-out to keep up, cycles constantly, dies at year 7 instead of year 15. £3,000+ of avoidable replacement cost. ### Cold rooms nobody can fix Insufficient pipework diameter to a radiator can't be resolved with more heat, the pipe is the limit. Retrofit is invasive. ### Boiler Plus non-compliance New installations must meet ErP 92% and one of load/weather compensation, FGHR or smart control. Non-compliant installs fail future homebuyer surveys. ### No zoning wastes fuel forever A single-zone whole-house system heats rooms nobody's using. Every winter, forever. Common mistakes we fix - Copying the old system layout without a heat-loss calculation - Choosing a combi for a 3-bathroom house - Under-specifying pipework diameter - Skipping the zone valve to save £150 - Not commissioning to Benchmark and leaving no records Our process ## From your first call to the completion certificate. - 1 ### Heat loss survey Room-by-room heat loss calculated to BS EN 12831, the basis of every design decision. - 2 ### System design Boiler size, radiator schedule, pipework layout, zoning and controls documented and priced in writing before work begins. - 3 ### First-fix installation Pipework run, radiators positioned, boiler roughed-in, all tested to pressure before floors and walls close. - 4 ### Second-fix & commissioning Boiler fired and commissioned to Benchmark, controls paired, inhibitor dosed, full system balanced. - 5 ### Handover Full walk-through, controls demonstrated, Benchmark log, Gas Safe notification, Building Control certificate. Benefits ## What you actually get for the money. ### Warm rooms, evenly Every room hits setpoint predictably, no more radiator lottery. ### Lowest possible running cost A properly designed system runs the boiler at its most efficient modulation range. ### Longest system life Right-sized, well-inhibited systems on modern boilers routinely deliver 15+ years without major intervention. ### Zoning that pays back Upstairs/downstairs zoning saves 10–15% of annual gas typically. ### Boiler Plus compliant Every install is designed to meet current UK regs so it holds up on future sale surveys. ### One accountable install Designed, fitted and commissioned by the same team, from first survey to final sign-off. Technical detail ## The design detail that makes a heating system quiet, cheap and reliable Design decisions upfront save you money for the next 15 years. Here's where the value lives. ### Heat loss and boiler sizing We calculate room-by-room heat loss to BS EN 12831 using measured U-values for the property fabric. Total is compared to modulating combi/system boiler output; oversizing costs efficiency and lifespan. ### Hot water strategy Combi for smaller homes with one bathroom and good mains pressure; system boiler with a G3-installed unvented cylinder for family homes with multiple bathrooms; heat-only where a conventional loft-tank arrangement is preferred. ### Pipework layout 22mm mains loops around the ground floor, 15mm to radiators, correct return arrangement to avoid short-circuit flow, drain-off cocks at every low point. Concealed runs where possible and correct clipping to avoid pipe noise. ### Radiator selection Sized to each room's heat loss at 50°C flow temperature to future-proof for heat pump compatibility. Correct valve pairings (TRV + lockshield) and access for future maintenance. ### Controls and Boiler Plus OpenTherm-compatible programmable thermostat, load or weather compensation on the boiler, TRVs on every rad, S-plan zone valves where appropriate. Optional smart heating via Vaillant vSMART, Hive, Nest or Tado. ### Commissioning and records Full Benchmark commissioning, system balancing to design flow rates, inhibitor dosed to X100, MagnaClean fitted, Gas Safe notification within 30 days, Building Control certificate issued. Frequently asked ## Questions we hear every week. How much does a full central heating installation cost?+£4,800–£7,500 for a straightforward 3-bed terrace with new boiler, 8 radiators, controls and full commissioning. Larger homes or unvented cylinder setups £8,500–£13,000. How long does it take?+3–5 working days for a full replacement in a standard 3-bed. 5–8 days for a full re-layout or unvented cylinder installation. Do you replace radiators too?+Yes, sized to the room, valves paired correctly, safely removed and disposed of. Can I keep my existing radiators?+Only if they're sound, correctly sized and clean. We'll assess and tell you honestly. What controls do you install?+OpenTherm-compatible programmable thermostats, smart controls where you want them (Hive, Nest, Tado, Vaillant vSMART), full TRV package. Is the system Boiler Plus compliant?+Every installation from us meets Boiler Plus regulations as standard, non-negotiable, protects your future sale. Do you install unvented cylinders?+Yes, Danny holds the G3 unvented qualification and can design and install a full mains-pressure hot water setup. What warranty do I get?+Full manufacturer warranty on the boiler (up to 10 years) plus 12 months DHP workmanship warranty on the whole installation. Book central heating ## Ready to get central heating sorted properly? Speak to Danny directly. Free quote in writing, honest advice, and a fair fixed price. No sales pressure, we’ve been at this for over 30 years for a reason. Call 07956 994429 Call 020 8244 0912Request estimate - Gas Safe registered #180521 - 4.9★ from 159 Google reviews - Office 8am–9pm, 7 days a week - Based in Greenwich · covers all SE London Related services ## Often booked together. See all services → Service ### Boiler Installation Learn more Service ### Heating Engineer Learn more Service ### Power Flushing Learn more Service ### Unvented Cylinders (G3) Learn more Gas Safe registered plumbing, gas & heating engineers with 40 years of local experience across South East London. Gas Safe #180521 Company No. 06064438 Services - Boiler Installation - Boiler Repairs - Power Flushing - Gas Safety Engineer - Landlord Gas Safety (CP12) - Gas Fires & Cookers - Heating Engineer - Central Heating Installation Service Areas - Greenwich · Woolwich - Blackheath · Eltham - Thamesmead · Plumstead - Abbey Wood · Erith - Dartford · Bexley · Sidcup Contact - 07956 99442924/7 Emergency - 020 8244 0912Office landline - info@dhplumbing.co.uk - London - Office: 8am – 9pm, 7 days a week © 2026 DHP London Ltd. All rights reserved. AboutOur WorkReviewsContactPrivacyTerms Call nowGet a quote