Table of Contents
- How to Find a Tankless Water Heater Installer Near You
- Tankless vs Storage Water Heater: Which Suits Your Home?
- Why a Gas Safe Registered Plumber Is Non-Negotiable
- What Affects Combi Boiler Installation Cost in 2026
- Questions to Ask a Tankless Water Heater Installer Near Me
- Common Mistakes When Hiring a Tankless Water Heater Installer
- Frequently Asked Questions
Last Updated: 2 October 2026
How to Find a Tankless Water Heater Installer Near You
Searching for a tankless water heater installer near me usually means one of two things: your old cylinder is on its way out, or you want endless hot water without paying to heat a tank all day. Either way, the quality of the installer matters far more than the brand of the unit. At Major Heat, our Gas Safe registered engineers fit and service these systems, and the pattern is always the same: a well-fitted unit performs for years, while a rushed one causes pressure problems within months.
So how do you choose? Start with registration, then reputation, then price. Most homeowners do it in reverse, which is why so many end up paying twice.
What to Check Before You Book Anyone
A tankless water heater, also called a continuous flow or instantaneous water heater, heats water only as it passes through the unit rather than storing it in a cylinder. That design changes what the installer needs to assess before quoting.
Run through this checklist before you book:
- Confirm the engineer holds a current Gas Safe registration for gas work
- Ask whether they have fitted your chosen model before
- Request a written quote that separates labour from parts
- Check how the installer handles emergencies and callouts
- Read recent reviews, not just the star rating
The Gas Safe Register’s official consumer guidance explains exactly what a registered engineer is legally permitted to do. If an installer hesitates on any of these points, walk away.
Tankless vs Storage Water Heater: Which Suits Your Home?
The right choice depends on how much hot water your household uses at once, and how much space you have. A tankless unit frees up the airing cupboard and never runs cold mid-shower, but it has limits.
| Factor | Tankless (continuous flow) | Storage (cylinder) |
|---|---|---|
| Hot water supply | Endless, on demand | Limited to cylinder size |
| Space needed | Small, wall-mounted | Cupboard or loft space |
| Running costs | Lower for light use | Higher standing losses |
| Best for | Smaller households, flats | Larger families, multiple bathrooms |
For a two-bathroom home with teenagers queuing for showers, a well-sized continuous flow unit usually wins. For a large property drawing hot water from several outlets at once, a stored system may still be the more practical answer. Many homes in Kent sit somewhere between the two, which is why an on-site assessment matters more than any online calculator.
Why a Gas Safe Registered Plumber Is Non-Negotiable
By law, anyone working on gas appliances in the home must be Gas Safe registered. This is not a nice-to-have credential. It is the legal requirement that separates a qualified engineer from someone who could put your household at risk.
A Gas Safe registered plumber carries an ID card listing exactly which types of work they are qualified to carry out. Not every registered engineer is certified for every appliance, so the card matters as much as the registration itself.
How to Verify a Gas Safe Registration Yourself
Verification takes about two minutes, and you should do it every time, even for a repeat visit.
- Ask to see the engineer’s Gas Safe ID card on arrival
- Check the photo matches the person at your door
- Confirm the card lists the type of work being carried out
- Cross-check the registration number on the official register
- Note the expiry date on the card
If the details do not line up, do not let the work proceed. A genuine engineer will expect you to check and will not be offended by the request.
What Affects Combi Boiler Installation Cost in 2026
There is no single figure for combi boiler installation cost, and any installer who quotes one over the phone without seeing your home is guessing. Pricing depends on the unit you choose, the complexity of the swap, and what your existing system can support.
The main factors are:
- The model and output rating of the new boiler
- Whether the flue position needs to change
- Condition of existing pipework and radiators
- Whether a system flush or filter is required
- Any relocation of the unit itself
Because these variables shift so much from home to home, the honest approach is a free survey and a written quote. Major Heat provides free quotes so you can see the full breakdown before committing.
Questions to Ask a Tankless Water Heater Installer Near Me
The best installers welcome questions. The ones who dodge them are usually the ones with something to hide. Here is what to ask before you sign anything.
- How long will the installation take, and will my water be off all day?
- What happens if the unit develops a fault in the first year?
- Do you handle the warranty paperwork, or do I need to?
- Will you service the unit annually, and what does that involve?
- Can you provide references from similar properties nearby?
Write the answers down. If an installer promises something verbally, ask for it in the quote. A written record protects you if a dispute ever arises, and it forces everyone to be clear about scope from the start.
Ask for the engineer’s Gas Safe registration number before the visit, not on the day. A quick check on the official register takes two minutes and tells you whether the person turning up is actually qualified for the work you need.
Common Mistakes When Hiring a Tankless Water Heater Installer
Most bad installations trace back to the same handful of errors, and nearly all of them happen before any tools come out.
Choosing on price alone. The cheapest quote often excludes the flush, the filter, or the labour to make good afterwards. You find out when the final invoice lands.
Skipping the registration check. Homeowners assume a van with a logo means a qualified engineer. It does not. Always verify the ID card.
Ignoring the sizing question. An undersized unit cannot keep up with demand, and an oversized one wastes money. A proper survey accounts for how many outlets run at once.
Not asking about aftercare. A boiler is a long-term commitment. Ask who services it, how quickly they respond to faults, and what the callout process looks like.
Never let an unregistered person work on a gas appliance, even for a “small” job. Beyond the safety risk, unregistered work can void your home insurance and create problems when you come to sell the property.
Frequently Asked Questions
Are tankless water heaters worth it for UK homes?
They suit homes with limited space and lower hot water demand, since they heat water on demand rather than storing it in a cylinder. The trade-off is that flow rates can struggle if two showers run at once. For larger households, a combi boiler often performs better. Ask your installer to assess your hot water demand, incoming water pressure and property layout before deciding.
Do I need a Gas Safe engineer to install a tankless water heater?
Yes. Any gas-fired water heating appliance must be installed by a Gas Safe registered engineer. It is a legal requirement, not a preference. You can check an engineer’s registration by asking for their Gas Safe ID card and verifying the licence number on the Gas Safe Register website. Never allow unregistered work on gas appliances, as it risks carbon monoxide leaks and invalidates your home insurance.
What is the difference between a combi boiler and a tankless water heater?
A combi boiler heats water directly from the mains and also powers your central heating, so it replaces both a boiler and a hot water cylinder. A tankless water heater typically handles hot water only and may need a separate heating source. For most UK homes with limited space, a combi is the more practical all-in-one option, but your installer can confirm which fits your pipework and demand.
How long does a tankless water heater installation take?
A straightforward swap on an existing compatible system can take a few hours. A first-time installation usually takes a full day or more, especially if new gas pipework, flue routing or electrical connections are needed. Your installer should give you a realistic timescale after a site survey. Ask whether the quote includes making good any walls or flooring disturbed during the work.
Finding the right installer comes down to doing the boring checks properly: registration, references, a written quote, and a clear plan for aftercare. Major Heat handles all of it for households across Kent, with Gas Safe registered engineers, free quotes before any work begins, and reliable emergency support when a system fails at the worst possible moment. Get started with Major Heat and book a free, no-obligation quote for your installation.