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Navien boiler prices.

Our Navien boilers start from £1,945 installed. Compare the range below, then get a fixed quote for your home. Prices include the boiler, installation and VAT.

Combi boilers

Navien NCB300 28kW
BudgetCompact size

Navien NCB300 28kW

5-Year Warranty*

Installed from
£1,945£2,015

Boiler, fitting & VAT included

Your monthly payment

Estimated monthly payment
£25.15
Cash price
£1,945.00
Deposit
£0.00
Amount of credit
£1,945.00
Term
120 monthly payments
Annual borrowing rate (fixed)
9.48%
Fees
£0.00
Estimated total interest
£1,073.00
Estimated total payable
£3,018.00
APR representative
9.9%

Illustrative estimate. The final payment and totals may differ due to rounding; your finance agreement confirms the exact repayments. Credit is subject to status, affordability and lender approval.

Estimates use 9.9% APR with equal monthly payments and assume no fees. At 0% APR the deposit is 25%; at 9.9% APR it is £250. Your Zopa agreement confirms exact payments, charges and available terms.

Finance example & terms
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Your quote stays fixed.

Get your fixed price online, including your boiler, fitting and VAT. Everything needed for your agreed installation is included, with no hidden costs or unexpected extras.

What’s included in an installation
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Find your Navien boiler

Compare models, features and warranties.

Compare the combi range

Navien NCB300 28kW

Navien NCB300

5-year iHeat package warranty

Keep the essentials compact

The NCB300 is Navien’s entry-level combi, with stainless steel heat exchangers and a compact design for cupboard installations. Check the space and servicing clearances, and compare the controls included in your quote.

Your Navien installation, handled by iHeat.

Founded by heating engineers, iHeat has a network of over 500 approved boiler installers across England, Scotland and Wales.

Our in-house engineers review installations against our 60-point checklist. Your installation includes commissioning, a demonstration of your controls and registration of your manufacturer warranty.

Meet our engineers
iHeat engineer fitting a boiler in a customer’s home

More than just the boiler.

Your installation price includes fitting and VAT, plus the essentials to get your heating running.

Boiler & fitting

Installed and commissioned by a Gas Safe registered engineer.

Heating controls

Wireless thermostat with a combi installation or conversion.

Chemical flush & filter

A chemical system flush and magnetic filter to help protect your boiler.

Flue & pipework

Flue runs up to 5m and required mains-gas pipe upgrades up to 12m.

Old boiler removal

Removal and disposal of your existing boiler, where safe.

Warranty & aftercare

Manufacturer warranty registration and 12-month workmanship cover.

Real installations. Real customers.

Hear from iHeat boiler customers about their installation experience.

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Ways to pay.

Pay in full or compare boiler finance with V12 Retail Finance.

Pay in full

Credit or debit card

Pay for your installation without taking out a finance agreement.

0% APR

12 or 24 months

Interest-free options on selected boilers and plans, with deposits from 0% to 50%.

9.9% APR representative

36 to 120 months

Choose 36, 48, 60 or 120 months. Interest increases the total amount you repay.

Representative example

Illustrative boiler finance example, not the price of a Navien model: cash price £1,945; deposit £0; amount of credit £1,945; 9.9% APR representative; fixed annual borrowing rate 9.48%; term 120 months; 119 monthly repayments of £25.14 and a final repayment of £25.78; total interest £1,072.44; total payable £3,017.44; fees £0.

Credit is subject to status, affordability and lender approval. Available plans depend on your boiler and package. LeadsUK Ltd trading as iHeat is a credit broker, not a lender.

Compare boiler finance options and terms

Find your Navien boiler.

Compare suitable models, installation prices and ways to pay.

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Everything included in your installation

Your fixed price includes your boiler, fitting and VAT.

  • Removal and disposal of your existing boiler, where safe
  • Installation of your new boiler by a Gas Safe registered engineer
  • All required pipework and fixings
  • Flue kit, extensions and elbows for runs up to 5 metres
  • Magnetic boiler filter
  • Carbon monoxide alarm
  • Chemical flush of your existing system
  • Gas soundness and leak testing
  • Rebalancing your heating system, if required
  • Required mains-gas pipe upgrades for runs up to 12 metres
  • Repairs to external brickwork affected by the installation
  • Parts and labour warranty direct with the manufacturer
  • 12-month workmanship warranty

Depending on your system

  • Wireless thermostat for combi replacements and conversions
  • Tank removal and re-piping for combi conversions
  • Safe removal and disposal of your old back boiler

Removal depends on safe access and condition. Asbestos tanks may be drained, sealed and left in place; back boilers affected by asbestos cannot be removed.

Not included

  • Asbestos removal
  • Scaffolding or access equipment
  • Powerflush (a chemical flush is included)
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