Where is Cosine based and what areas do you cover?

Cosine Electrical is based at Waerenga in the North Waikato, between Te Kauwhata and Morrinsville. We cover the wider Waikato and South Auckland — from Manukau down to Te Awamutu, east to Thames, west to Raglan. Drive times from Waerenga: Hamilton 30-40 minutes, Cambridge 40 minutes, Pukekohe 30 minutes, Manukau 45 minutes, Raglan 75 minutes, Thames 60 minutes.

What is the digger operator on the crew thing?

Most electricians sub-contract digging for underground work — second contractor, second quote, second site visit. Cosine has a skilled digger operator on the crew, so for underground jobs we trench our own runs. One quote, one team, one site visit. Note: Cosine is not a registered drainlayer. Wastewater and stormwater scope sits with a licensed drainlayer.

How quickly do you get back with a quote?

Within 24 hours of the site visit. Itemised, in writing, valid 30 days. For smaller jobs we can often give a rough indication over the phone if you text photos of the existing setup.

What does a switchboard upgrade cost?

A straight switchboard upgrade in an average three-bedroom Waikato house is typically $1,500-$2,500 plus GST for board and labour. Push-ups: old cable failing insulation tests, mains upgrade needed (lines company involvement), asbestos in the meter-box backing board common in 60s and 70s houses. Everything flagged in the written quote — no surprises on the invoice.

What does an EV charger install cost?

Standard install with the existing switchboard up to spec is $1,200-$1,800 plus GST plus the charger. Older home needing a board upgrade adds $1,500-$2,500. Long trenched runs to a detached garage on a lifestyle block typically $2,500-$4,500 all-in.

Do you do compliance testing for landlords?

Yes — landlord WOF-equivalent inspections, RCD function tests, written reports with photos and plain-English findings. Insurance-ready paperwork.

Do you work with builders on renovations?

Yes — preferred sparky for several builders across Hamilton, Cambridge and Pukekohe. We walk through with the homeowner and builder before quoting, mark up the plans, and work to the builder's schedule. We don't hold up the next trade.

Can you handle commercial maintenance for property managers?

Yes — scheduled maintenance contracts, emergency callouts, fault-finding, compliance reporting. One number, one paperwork system, no padded packages and no lock-ins.

Do you certify the work?

Always. Every new circuit and every board upgrade gets a Certificate of Compliance emailed through within a day of the job finishing. Required for insurance, future sale and any audit.

What if you cannot fix a fault in one visit?

Some faults like earth leakage on a circuit shared by multiple cables genuinely need a second visit. Day 1 we isolate the faulty section onto its own RCBO so the rest of the house keeps power. Day 2 we test and replace the bad section. We don't punch holes in walls to brute-force the search.

WiFi Heater Install in Raglan — Redwood, Rinnai, Goldair and the Coastal Setup

Kris Goff

Jun 18

2 min read

WiFi Heater Install in Raglan — Redwood, Rinnai, Goldair and the Coastal Setup

Call Kris on 021 466 666

Raglan's heater install pattern is different from inland — bach owners wanting heaters that work intermittently and don't corrode out, full-time residents heating older Wainui Road or Bow Street homes through wet winters, salt-air considerations on every outdoor or coastal-exposed install.

What a WiFi heater install actually involves

Plug-in — quick if the socket position works.
New socket + plug-in — for cases where there's no socket where the heater needs to go.
Permanently wired — for higher-wattage units, bathrooms.

What's specific to Raglan WiFi heater installs

Bach intermittent use. A heater switched on hard for a weekend then idle for weeks ages differently. We'll suggest brands that handle the on-off cycle.
Coastal exposure. Outdoor or covered-deck heaters need IP-rated and marine-safe units.
Older bach switchboards. Many Raglan baches still run on 70s-80s boards. Heater install often requires an RCBO add or full board lift first.
Absentee Auckland and Hamilton bach owners. We quote off photos, schedule for an access window, send back the certificate and finished-job photos.
Scheduling matters. WiFi heaters in baches benefit hugely from scheduling — on before arrival, off when family leaves.
Wainui Road and central Raglan full-time homes — standard multi-room install with salt-air considerations.

Brand options

Redwood WIFI V2 (reliable for intermittent use), Rinnai (strong WiFi range), Bromic (outdoor marine-grade), Goldair, Devola.

What it costs

Bach single heater install $150-$300. New socket + install $350-$550. Permanent wired $500-$800. Multi-heater (3-5 rooms, one visit) $1,200-$1,800. Switchboard refresh adds $1,500-$2,500.

Call Kris on 021 466 666

For absentee bach owners: send photos of the rooms and the switchboard, plus the heater models.

WiFi Heater Install in Raglan — Redwood, Rinnai, Goldair and the Coastal Setup

WiFi Heater Install in Raglan — Redwood, Rinnai, Goldair and the Coastal Setup

What a WiFi heater install actually involves

What's specific to Raglan WiFi heater installs

Brand options

What it costs

Call Kris on 021 466 666

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