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We'll Buy Your Old Diesel Or Gas Boiler For Up To $3,000*
Trade in your fossil-fuel boiler this month and upgrade to a high-temperature air-to-water heat pump that works with your existing radiators and underfloor heating. Canterbury homeowners with solar PV receive an additional bonus up to $500.
*Please Note: Price is subject to an on-site consultation. Additional installation charges may apply. T&Cs apply.
The Problem You're Facing
Your diesel or gas boiler is costing you money every single month:
Fuel costs are climbing – Diesel and LPG prices keep rising with no end in sight
Maintenance headaches – Boilers need regular servicing, repairs, and eventual replacement
Your solar sits idle in winter – Your PV system is generating power you can't use for heating
It's a liability, not an asset – Every month you wait, you're burning money
Your old boiler is worth up to $3,000* right now. But $0 when it breaks later.
Your Solution: Warmth.nZ R290 High-Temperature Heat Pump Retrofit
Unlike standard heat pumps, Warmth.nz’s R290 air-to-water heat pumps deliver the high-temperature water (up to 75°C) your existing hydronic system needs—without replacing a single radiator or pipe.
Here's What You Get:
Up to $3,000 Trade-In Credit
Your old boiler has value. We'll prove it.
Additional $500 Solar Bonus
$100 per 5kW of existing solar installed (up to $500)*
Industry-Leading 75°C Output
Hot enough for any existing radiator or underfloor system
Environmentally Friendly R290 Refrigerant
Low Global Warming Potential (GWP) of just 3
Durable Compressor
Operates efficiently even at -25°C Canterbury conditions
SG Ready PV Compatible
Smart grid integration with your existing solar system
ERP A+++ Energy Rating
Maximum efficiency with excellent COP ratios
5-Year Unit Warranty
Comprehensive warranty backing our confidence in reliability
0-1% Green Home Loans Available
Affordable financing options
"But Heat Pumps Can't Run Hot Enough for My System…"
That's true for standard heat pumps. Not ours.
Most heat pumps top out at 50-55°C—too cold for many existing radiator systems designed for 65°C+ boiler water.
Warmth.nz’s R290 high-temperature heat pumps are specifically engineered for boiler replacement:
Output temperatures up to 75°C – Industry-leading maximum operating temperature
Maintains performance down to -25°C – Proven in the coldest Canterbury conditions
Works with existing radiators and hydronic floors – No system modifications required
Robust, durable compressor – Built to endure tough New Zealand conditions
This is boiler replacement done right.
Want to See it in person? Visit Warmth.NZ at Booth 48, Canterbury Home Show, 20–22 March 2026, Wolfbrook Arena.
How Much Will You Actually Save?
Let's do the maths on a typical 200m² Canterbury home:
Current System (Diesel Boiler):
2,500L Diesel per year @ $1.80/L = $4,500/year
Plus servicing, maintenance, and repairs = $4,800+/year
Warmth.nz R290 Heat Pump Retrofit:
Annual heating cost with heat pump = $1,800/year
With solar PV? Even less – potentially under $1,000/year
Annual Savings: $3,000+
Payback: 3-5 years.
Comfort: Decades.
Warmth.NZ Boiler Conversion ROI Calculator
How we estimate this: R290 heat pump COP 3.5. Diesel ~14.9¢/kWh heat, natural gas ~11.2¢/kWh, LPG ~13.8¢/kWh. Boiler efficiencies: diesel 80%, gas 85%, LPG 82%. CO₂ per MfE, NZ grid 98g/kWh. Results are estimates only and actual savings may differ.
Real Canterbury Installations
"Our bill has gone down substantially. I've seen the pattern and I watch the graphs, and I'm very confident that we're going to save a lot of money. We've been very happy, and we'd thoroughly recommend Warmth."
— Brian K., Christchurch
"The product is amazing - our house sits at 20 degrees all day in winter with no heat pump on and everything works well. It is great that I was able to work with both them and One Vision Solar to create a system which runs on solar and makes heating my floor and house even more affordable."
— Dan G., Canterbury
Nigel & Claire
"If I were to build again, I would undoubtedly choose underfloor heating and Warmth.NZ," he states. "The quality of their work and their commitment to customer satisfaction impressed me. They delivered a warm, comfortable home within our budget and helped us avoid a cookie-cutter solution."
Brian
"Getting older, we just didn’t want fireplaces or log burners. So we chose underfloor heating," says Brian. “Our bill has gone down substantially. I’ve seen the pattern and I watch the graphs, and I’m very confident that we’re going to save a lot of money. We’ve been very happy, and we’d thoroughly recommend Warmth.NZ.”
"After a last-minute letdown by another company, we turned to Warmth.NZ. It was the best decision we could have made. They were not only timely but also logical in their approach and really great to interact with. Our bills have never reached the levels seen in our previous properties, and we've maintained an extremely comfortable indoor temperature. We wouldn’t hesitate to use them again in another build.”
- Greg M
“We absolutely love our underfloor heating system & we believe it’s the best way to heat a house. Well done to the crew at Warmth.NZ for such a good job! Their communication and workmanship were outstanding!”
- Roger M
“The product is amazing - our house sits at 20 degrees all day in winter with no heat pump on and everything works well. The guys at Warmth.NZ are friendly and know their stuff.
It is great that I was able to work with both them and One Vision Solar to create a system which runs on solar and makes heating my floor and house even more affordable.
If you are looking for a cost effective heating solution and want to incorporate in slab heating, hot water heat pump and solar, I would highly recommend talking to Warmth.NZ”
- Dan G
“Warmth.NZ supplied a replacement heat pump (supplied by a third party) to our existing underfloor system of seven years. From initial contact the knowledge and experience of underfloor systems ensured we were in good hands.
The install team were professional and friendly, the heat pump supplied is quiet and easy to operate and our power bill has reduced.
Our home is warm again as only hydronic underfloor can do. Huge thank you to Zsuzsa, Brian and team, they are specialists in hydronic underfloor heating”
- Keith M
Why Warmth.NZ?
Hydronic Heating Specialists – Not general installers trying to learn as they go
Proven Canterbury Track Record – Years of successful boiler replacements in local conditions
Solar-First Integration – We design systems that maximize your existing PV investment
Premium R290 Technology – Industry-leading high-temperature heat pumps engineered for boiler replacement
No Fossil Fuel Heating Offered – We only install future-proof solutions
Up to $3,000* off your installed heat pump retrofit — transparent pricing with no hidden costs.
Limited Offer — Secure Your Spot
This special pricing is available for a limited time and in limited quantities. Once the allocation is filled, standard pricing applies.
If you’ve been considering replacing your hot water system, now is the ideal time.
The Numbers Tell the Story — and They’re Surprisingly Clear
Provider
Competitor A
Product Size
190L
Price
$7,000
Value
Lower Capacity
Provider
Competitor B
Product Size
270L
Price
$7,000
Value
Higher Price
Provider
Competitor C
Product Size
280L
Price
$7,325
Value
Highest Price
Provider
Warmth.nz
Product Size
270L
Price
$6,499
Value
Best Price
Your Next Step: Free Retrofit Assessment
Here's how it works:
1. Request Your Assessment – Quick online form (2 minutes)
2. Initial Consultation – We'll qualify your project online or via phone
3. Site Visit – Paid assessment (credited back on installation)
4. Custom Proposal – Detailed quote with savings projections
5. Professional Installation – By our specialist hydronic team
No fossil fuel heating. No standard heat pumps. Just high-temperature Warmth.nz R290 retrofits that actually work.
Get Your Warmth.NZ 2-in-1 Heat Pump Hot Water Cylinder
Claim UP TO $3,000* Boiler Trade-In Now
Offer valid for consultations booked this month only
Trade-in credit: $1,000 off systems over $10k, $2,000 off systems over $15k, $3,000 off systems over $20k. Solar PV Bonus: $100 per 5kW installed, up to $500 maximum. Valid for consultation requests submitted this month. Site assessment fee applies, credited back on installation. 0-1% Green Home Loan availability subject to lender approval. T&Cs apply.
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