Heat Pump Hot Water Systems in Yarraville

In renovated Yarraville cottages the incumbent is most often a gas instantaneous unit hanging on an external wall, fitted during whichever renovation last touched the bathroom. In unrenovated ones it is an electric storage tank in a lean-to laundry or tucked into a side alcove. Both are common and both replace fine.

The gas instantaneous case is worth thinking about carefully. Those units heat on demand and never run out, which is a genuine advantage. A heat pump stores hot water instead, so tank size and reheat time matter in a way they did not before. On a small cottage with one bathroom that is easy. On a renovated cottage with two bathrooms and a family it needs sizing honestly.

Narrow cottage blocks with rear extensions leave a side gap that is often under a metre, sometimes with a fence on one side and a wall on the other. That is a poor position for a heat pump. Airflow is restricted, the cold exhaust has nowhere to go, and compressor noise reflects between two hard parallel surfaces directly into the neighbouring cottage.

The rear yard behind the extension is usually the answer, which costs extra pipe and cable but produces a system that runs properly and does not generate a phone call. We measure the route, price it honestly, and show the side position as the alternative it is rather than the default.

This is the single most common thing we find in Yarraville. Original wiring, a 1980s addition, a 1990s kitchen circuit and a modern extension sub-board, all coexisting with varying levels of documentation. Adding a dedicated hot water circuit into that requires working out what is actually live and what feeds what.

It is not usually a disaster. It usually just means the electrical component of the job takes a bit longer than a straight estate house, and that we may recommend consolidating rather than adding another layer. Where a board upgrade is the sensible outcome, we price it as its own line rather than folding it in.

The other reason we look carefully is that Yarraville extensions often have their own small sub-board, and the hot water circuit may be better fed from there than from the original board at the front of the house. Working that out first can save a long cable run through a cottage that has no easy path from one end to the other.

Small original roof planes at the front and large flat or skillion rear extensions is the classic Yarraville profile, and that rear extension is usually the only roof space worth putting panels on. Arrays here are therefore modest, and often already sharing that roof with an air conditioning condenser.

Modest solar still pairs well with a heat pump, because hot water is a small, shiftable load. Even a 3 to 5kW array on a rear extension will typically cover an afternoon heating cycle. We set the timer window to match whatever generation you actually have rather than assuming a full-size system.