Boiler Installation in Stevenage
What we've learned from fitting boilers across SG1 and SG2
Stevenage is a New Town, and that shapes almost every boiler installation we do here. The bulk of the heating systems we replaced were originally fitted between 1955 and 1975, on properties built rapidly in waves – Bedwell first in 1952, Broadwater and Shephall in 1953, Chells through the 1960s, then Pin Green and Symonds Green. A lot of those original systems used microbore pipework that’s narrower than today’s 22mm and 15mm runs, and the boilers were sized for the household demands of seventy years ago, not modern bathrooms and washing machines. Then there’s Old Town – the historic core that pre-dates the New Town entirely, with Edwardian and Victorian terraces along the High Street that throw up completely different challenges.
Each neighbourhood in Stevenage throws up something different on a boiler installation, and the quote you get should reflect that. We price every job honestly and tell you upfront what yours actually involves.
The water in Stevenage matters more than most people realise
Stevenage sits on the same Affinity Water chalk supply network as the rest of north Hertfordshire, with water hardness in town typically around 300–350 mg/l of calcium carbonate. Classed as very hard. For a modern combi boiler, that translates to noticeable heat exchanger scaling over five or six years, particularly in the higher-flow systems serving multi-bathroom family homes in Great Ashby and Chells Manor.
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The boilers we install most often around Stevenage
Vaillant
Our preferred brand for system boiler upgrades and the larger Great Ashby and Chells Manor properties where there's an existing cylinder. The ecoTEC plus range is quiet, energy-efficient, and reliable - and the warranty terms when fitted by an accredited installer (we are) run up to 12 years.
Ideal
Strong mid-budget choice that's well suited to the post-war estate housing across Bedwell, Shephall and Broadwater. The Logic Max and Vogue Max ranges are easy to service, parts availability is excellent, and the warranties are competitive.
Worcester Bosch
We install Worcester where it suits the property or when specifically requested. Generally we position it as an alternative rather than our primary recommendation, but if it's the right fit for your home we'll guide you honestly.
What a boiler installation in Stevenage actually involves
Survey and quote
We come to the property, measure up, check the gas supply size, inspect the radiators and pipework, and ask about your hot water demand. You get a written, fixed-price quote within 24–48 hours.
Install day
Old boiler isolated and removed in the morning. Power flush or chemical clean of the existing system at midday - particularly important on the older Stevenage estates where the radiators have been carrying magnetite sludge for decades. New boiler hung in the afternoon, gas connected, condensate routed, magnetic filter fitted, inhibitor added.
Commissioning
Radiators balanced, flow temperature set for proper condensing efficiency (most installers leave this on factory default at 75°C, which is far too high - we'll typically run a combi at 55–60°C flow to keep it condensing properly and your gas bill down), controls tested, walkthrough with you, warranty registered.
The properties where the install gets more interesting
Old Town terraces around the High Street
Pre-war, Victorian and Edwardian properties along Stevenage High Street and the surrounding streets. The recurring issues are flue routing through period brickwork and the existing 15mm gas supply – modern combis often need a 22mm upgrade. We test on the survey and tell you whether yours needs upgrading.
Bedwell, Broadwater, Shephall - 1950s New Town estates
Often have original microbore pipework feeding the radiators. Microbore restricts flow and isn’t always compatible with a high-output modern combi. We carry out a flow-rate test on the survey and either work with the existing pipework or quote separately for upgrading the main runs.
Chells, Chells Manor and Pin Green - 1960s and 70s estates
Generally the most predictable installs in Stevenage. Standard 15mm and 22mm pipework, clear airing cupboards, easy flue exits. Most are done in a single day.
Great Ashby and Symonds Green - newer detached homes
Larger family properties typically with two bathrooms, often originally fitted with system boilers and unvented cylinders. We frequently upgrade these to higher-output Vaillant systems where hot water demand is high.
What it costs
A like-for-like combi swap in Stevenage usually lands £2,200–£3,200 fitted, depending on the brand and warranty length. More involved jobs – system conversion, back-boiler removal, relocation, larger system boiler with cylinder work – typically sit £3,200–£4,800. Anyone quoting under £1,800 is either using a budget brand or skipping the flush, filter or scale reducer. Full fixed price upfront on email, everything itemised.
Why Choose Vantage?
With over 700 five-star reviews, fully qualified and accredited engineers, transparent pricing, and a 12-month labour guarantee on every job, Vantage delivers reliable, high-quality workmanship you can trust with no call-out fees, fast response times, and genuine local service.
- Five-star Google reviews
- Gas Safe Registered No. 956889
- CHAS Registered
- City & Guilds qualified
- Checkatrade approved
- 12 month labour guarantee on every job
- Fully stocked vans most jobs fixed on the first visit
- 24/7 emergency availability
- Finance available on eligible installations
- Established local business with a dedicated office team and multiple qualified engineers
- No job too small
- No call-out fee first hour diagnosis from £99 for the first hour + VAT, then a fixed price is provided before any work begins
- 700+ reviews across Google, Checkatrade, Trustatrader & Trustpilot 4.9 star average
Areas we cover for boiler installation around Stevenage
we’re with you every working day. Other postcodes, call 01462 506 374.
FAQs
How quickly can you actually survey my Stevenage home?
For a planned install, usually within 3–5 working days. If your old boiler has packed up and you’ve got no heat or hot water, we prioritise – same-day or next-day in most cases.
My house has microbore pipework - will a new combi work?
Often yes, but it depends on the boiler output and hot water demand. We do a flow-rate test on the survey. If the existing microbore can’t keep up, we either fit a lower-output combi or quote for upgrading the key runs to 22mm. We’ll never install a boiler we know won’t perform properly.
Will you fit a boiler I've bought myself?
Generally we don’t. The manufacturer warranties we offer (up to 12 years on Ideal and Vaillant) are conditional on us being an accredited installer and registering the install. If you supply the boiler, the warranty drops to the standard 2 years. Almost always works out worse.
How long does the install take?
A like-for-like combi swap is usually a single day. System conversions, back-boiler removals and relocations can take 2 days. We tell you upfront which yours is.
Can you upgrade my old vented system to a combi?
Yes, and we do this regularly across Stevenage – particularly in the New Town estates where the original 1950s and 60s vented systems with cold tanks in the loft are still common. The cylinder and tanks come out, the pipework is reconfigured, and you get the airing cupboard back as usable space.
Are you actually local to Stevenage?
Yes. Our office is on Bancroft in Hitchin, our engineers live across Hitchin, Stevenage and Letchworth, and our vans are on the road in SG1 and SG2 every working day. Not a call centre routing jobs to subcontractors.
Get a fixed-price boiler quote for your Stevenage home
Online quote in under 2 minutes. Fixed price by email, no obligation, no follow-up sales calls.