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Trusted Traders

Sleeman Heating Limited

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4.9

15 Reviews

About

Hi – I m John Sleeman.

My company installs energy efficient German and Dutch condensing boilers, and solar panels and we specialise in heating installations in North and Central London.

Aims

To offer competition to the large heating companies who seem to charge a high price for services that are adequate but unexceptional. I aim to provide a good quality service at a competitive price.

I offer good technical knowledge of central heating, plus the ability to design systems that conform to the best modern standards. Good communication with customers is important to me, as is the continued good operation of my installations. I offer a 2 year guarantee on my workmanship and the boilers I install are covered by guarantees on parts and labour , some of them for 5 years. I use only responsible and competent co workers.

Services provided

Boiler replacement

Complete Heating Installations

Unvented hot water systems

Solar powered hot water

What we do

  • Boiler, central heating and gas engineers

    • Boiler installation
    • Boiler repair
    • Radiators and central heating
    • Boiler servicing
  • Renewable energy

    • Solar water heating
  • Heating contractors

    • Central heating systems (installation and servicing)

Customer reviews

Reviews summary

4.9
15 reviews
Customer Service
4.9
Quality
4.9
Value
4.9
Sort by
Professional & competent
Customer Service
Quality
Value
Very thorough. Took longer than expected, but the explanation was acceptable.
Matthew, London14/06/2017
Reliable, professional
Customer Service
Quality
Value
Great job for renewal of entire heating system, no problems with new boiler and great savings from solar hot water system.
Oliver, London09/06/2017
Fixed a complicated issue.
Customer Service
Quality
Value
We had numerous people try to identify our plumbing issue, and John was the only one able to do so. He then came back to implement the solution and worked 2 x 12 hour days, and left the house tidy. Very impressed.
Ruth, London06/06/2017
Very happy - super fast work
Customer Service
Quality
Value
Extremely fast and efficient service. My existing boiler was on its last legs. Phoned John on Tuesday, he came to have a look on Wednesday, gave me a quote on Thursday and fitted the boiler on Monday! Less than a week from start to finish. Boiler was installed in one day by John and Marko, both are very friendly and professional and even cleaned up afterwards. Definitely recommend!
Philip, London08/05/2017
Expert, friendly heating engineer
Customer Service
Quality
Value
John Sleeman put twice a new boiler into my premises. He gave very good advice, took time to explain everything and was efficient with good time management. I have no hesitation to recommend him to further customers.
Angelika S16/09/2016
Trustworthy, efficient, reliable and eloquent.
Customer Service
Quality
Value
I had had some work done previously by another contractor (not a Which? trader) which proved to be faulty and was at great pains not to have a repeat of this so asked a trusted architect for a recommendation and he forwarded Sleeman Heating's details. I can attest that was a good call. I received excellent service. Fault found and corrected with a cost effective solution professionally, efficiently and punctually with an eloquent, pleasant and calm manner.
Suzanne H09/09/2016
Reliable, friendly and efficient
Customer Service
Quality
Value
Very glad I chose this trader. Arrived on time and did exactly what was needed. Will certainly use them again and would recommend them.
Emma, London27/02/2016
Trusted tradesman
Customer Service
Quality
Value
John has installed boilers at two of my properties. Both were difficult jobs. I have used John because I have confidence in his abilities and he has also found ways to avoid costly measures such as scaffolding. I will use him again for any other installs and servicing.
CMR40288848426/05/2015
First class job.
Customer Service
Quality
Value
We were very pleased with our new boiler installation. His timekeeping was excellent, he was organised, professional in his work, and all appears well. He was very tidy and pleasant, and we had full confidence in him.
David, London26/05/2015
Outstanding professional job
Customer Service
Quality
Value
Mr Sleeman recommended and fitted our boiler 2 years ago and I couldn't be more pleased with both the initial installation and price and in the follow up servicing. All thoroughly professional and efficient. I can't recommend him highly enough.
Andrew, London08/04/2015