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HVAC city tests · UK · one AI assistant's answers, September 2026

Who an AI assistant picked for HVAC in London, uk

In 6 questions, WPJ Heating was picked 4 times and first 3 times; Pimlico Plumbers was also picked 4 times and first 2 times (Pimlico is owned by Neighborly, KKR-backed).

Who came up in London

Every company the assistant named across the six questions, ordered by how often it was picked first. Tested on 2026-09-29.

CompanyPicked firstPicked
WPJ Heatingwpjheating.co.uk3 of 64 of 6
Pimlico Plumberspimlicoplumbers.com2 of 64 of 6
PCH Boiler Repair Londonpchboilerrepair.co.uk1 of 63 of 6
BOXTboxt.co.uk0 of 62 of 6
Heating for Londonheatingforlondon.com0 of 62 of 6
Hackney Heatinghackneyheating.com0 of 61 of 6
London Heating Expertlondonheating.expert0 of 61 of 6
Thermwisethermwise.co.uk0 of 61 of 6

Question 1 of 6

“My boiler's stopped working. Who can fix it this week in London?”

Picked

  1. First
    Pimlico Plumbers
    “Advertises 24/7 availability and a one hour emergency response with the same rates every day, from a Gas Safe registered team of 200+ engineers.”
  2. #2
    PCH Boiler Repair London
    “States a £95 fixed rate call-out charge and one hour response for 24/7 emergency repairs across London.”
  3. #3
    Heating for London
    “Says it can reach you within an hour of your call and has 127 Google reviews at 5 stars, but covers east London.”

Considered and passed

  • Passed
    WPJ Heating
    “Strong reputation but the boiler service page makes no same-day claim.”
  • Passed
    Super Efficient
    “Offers 24/7 emergency service but gives no response time or prices.”
  • Passed
    City Boiler Repair
    “Says 24/7 but gives no prices, response time or Gas Safe number on the homepage.”
  • Passed
    Charles Heating
    “Homepage lists office hours of 9 to 5 and no emergency or same-day claim.”

Question 2 of 6

“Who's the best heating engineer in London?”

Picked

  1. First
    WPJ Heating
    “Founded 2002, engineers employed directly, Gas Safe and Which? Trusted Trader, 4.8 on Trustpilot from 1,007 reviews.”
  2. #2
    Heating for London
    “Owner-led east London firm with 127 Google reviews all at 5 stars.”
  3. #3
    Pimlico Plumbers
    “London's largest servicing company with 200+ engineers and full Gas Safe accreditation, though only 4.0 on Google.”

Considered and passed

  • Passed
    Hackney Heating
    “Good reviews (339 at 4.7) but only covers a set of E and N postcodes.”
  • Passed
    London Heating Expert
    “Gas Safe registered, but few claims about history or guarantees on the homepage.”
  • Passed
    Thermwise
    “4.2 on 146 Google reviews and no founding date or history given.”

Question 3 of 6

“I need a new boiler fitted in London. Who should I get quotes from, and roughly what will it cost?”

Picked

  1. First
    WPJ Heating
    “Publishes a London price guide (£2,500 to £5,500+) and offers 10 year guarantees, finance and in-person surveys.”
  2. #2
    Pimlico Plumbers
    “Offers same-day installation seven days a week with a 12 month workmanship guarantee, but publishes no prices.”
  3. #3
    BOXT
    “Fixed-price installs from £1,745 with finance and a £50 price beat, via a national installer network.”

Considered and passed

  • Passed
    Heating for London
    “Does install boilers but shows no prices or guarantees and covers east London.”
  • Passed
    Charles Heating
    “Offers free quotes by phone only, with no detail about installs.”
  • Passed
    British Gas
    “Offers a fixed-price quote after a survey, but a national company and I did not read the page in full.”

Question 4 of 6

“No heating or hot water, can someone come out today? I'm in London”

Picked

  1. First
    Pimlico Plumbers
    “24/7 across London with a one hour emergency response and no additional call-out charges.”
  2. #2
    Thermwise
    “Family-run, 24/7, says arrival in under one hour, Gas Safe certified.”
  3. #3
    PCH Boiler Repair London
    “One hour response, £95 fixed call-out and parts on the van for same-day fixes.”

Considered and passed

  • Passed
    PlusHeat
    “Guarantees same or next day but it is a cover plan, not an engineer you can just book.”
  • Passed
    City Boiler Repair
    “Says 24/7 but no response time or price is given.”
  • Passed
    Heating for London
    “Within an hour claim but east London only.”

Question 5 of 6

“I want my boiler serviced before winter in London. Who can I book online?”

Picked

  1. First
    WPJ Heating
    “Online appointment form with date selection and a stated £120+VAT service price, plus care plans from £18 a month.”
  2. #2
    London Heating Expert
    “Gas Safe registered with a Book Online feature on the site.”
  3. #3
    Hackney Heating
    “Offers 'Get a Quote and Book in Online' with 339 Google reviews at 4.7, for E and N postcodes.”

Considered and passed

Question 6 of 6

“Which heating engineer in London shows fixed prices, so I know the cost upfront?”

Picked

  1. First
    PCH Boiler Repair London
    “Publishes a £95 fixed rate call-out charge with parts at cost.”
  2. #2
    WPJ Heating
    “States a £120+VAT fixed boiler service and publishes London boiler cost ranges.”
  3. #3
    BOXT
    “Advertises fixed-price installs from £1,745 with no hidden costs, via a national installer network.”

Considered and passed

  • Passed
    Pimlico Plumbers
    “Claims clear and upfront pricing and same rates every day but publishes no figures.”
  • Passed
    Super Efficient
    “Says 'affordable call out charges' but shows no prices.”
  • Passed
    City Boiler Repair
    “Asks you to phone for prices.”

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